diff --git a/deployment/aliyun/host-rust-lob-shadow-gate.sh b/deployment/aliyun/host-rust-lob-shadow-gate.sh
index 7e4821256..78292a070 100755
--- a/deployment/aliyun/host-rust-lob-shadow-gate.sh
+++ b/deployment/aliyun/host-rust-lob-shadow-gate.sh
@@ -27,7 +27,27 @@ usage() {
     '' \
     'Production gates always observe at least 3600 seconds.' \
     'Tests may set MONDAY_GATE_TEST_SECONDS only with' \
-    'MONDAY_ALLOW_SHORT_GATE_FOR_TESTS=1; test evidence cannot pass cutover.'
+    'MONDAY_ALLOW_SHORT_GATE_FOR_TESTS=1; test evidence cannot pass cutover.' \
+    'Test-only health settling may use MONDAY_TEST_HEALTH_SETTLE_SECONDS only' \
+    'with MONDAY_ALLOW_SHORT_GATE_FOR_TESTS=1 and a value below 2400 seconds;' \
+    'otherwise the policy check fails.'
+}
+
+resolve_health_settle_seconds() {
+  health_settle_seconds=$HEALTH_SETTLE_SECONDS
+  if [[ -n ${MONDAY_TEST_HEALTH_SETTLE_SECONDS:-} ]]; then
+    [[ $test_only == true ]] \
+      || die 'short health settles require a test-only gate'
+    [[ ${MONDAY_ALLOW_SHORT_GATE_FOR_TESTS:-0} == 1 ]] \
+      || die 'short health settles require MONDAY_ALLOW_SHORT_GATE_FOR_TESTS=1'
+    [[ ${MONDAY_TEST_HEALTH_SETTLE_SECONDS} =~ ^[1-9][0-9]*$ ]] \
+      || die 'test health settle duration must be a positive integer'
+    (( ${#MONDAY_TEST_HEALTH_SETTLE_SECONDS} <= ${#HEALTH_SETTLE_SECONDS} )) \
+      || die 'test health settle duration is too large'
+    ((MONDAY_TEST_HEALTH_SETTLE_SECONDS < HEALTH_SETTLE_SECONDS)) \
+      || die 'test health settle duration must be shorter than the formal settle duration'
+    health_settle_seconds=$MONDAY_TEST_HEALTH_SETTLE_SECONDS
+  fi
 }
 
 [[ ${EUID} -eq 0 ]] || die 'must run as root'
@@ -110,6 +130,7 @@ if ((gate_seconds < REQUIRED_DURATION_SECONDS)); then
     || die 'short gates require MONDAY_ALLOW_SHORT_GATE_FOR_TESTS=1'
   test_only=true
 fi
+resolve_health_settle_seconds
 
 env_value() {
   local file=$1
@@ -230,12 +251,14 @@ jq -n \
   --arg deployment_bundle_sha256 "$deployment_bundle_sha256" \
   --arg deployment_source_revision "$deployment_source_revision" \
   --argjson requested_duration_seconds "$gate_seconds" \
+  --argjson health_settle_seconds "$health_settle_seconds" \
   --argjson test_only "$test_only" \
   '{schema:$schema,run_id:$run_id,created_at:$created_at,
     candidate_sha256:$candidate_sha256,
     deployment_bundle_sha256:$deployment_bundle_sha256,
     deployment_source_revision:$deployment_source_revision,
-    requested_duration_seconds:$requested_duration_seconds,test_only:$test_only}' \
+    requested_duration_seconds:$requested_duration_seconds,
+    health_settle_seconds:$health_settle_seconds,test_only:$test_only}' \
   >"$evidence_dir/run.json"
 chmod 0640 "$evidence_dir/run.json"
 
@@ -429,7 +452,7 @@ health_catalog_sha256() {
     | sha256sum | awk '{print $1}'
 }
 
-settle_deadline=$(( $(monotonic_seconds) + HEALTH_SETTLE_SECONDS ))
+settle_deadline=$(( $(monotonic_seconds) + health_settle_seconds ))
 while ! health_passes spot || ! health_passes usdm; do
   (( $(monotonic_seconds) < settle_deadline )) \
     || die 'shadow health did not reach the fail-closed gate before the settle deadline'
@@ -590,7 +613,7 @@ manifest_uris() {
   local listing=$2
   local prefix line token max_age_seconds
   prefix="oss://${oss_bucket[$market]}/lake/raw/venue=binance/market=${market}/dataset=${dataset[$market]}/shard=${shard_id[$market]}/"
-  max_age_seconds=$((gate_seconds + HEALTH_SETTLE_SECONDS + 3600))
+  max_age_seconds=$((gate_seconds + health_settle_seconds + 3600))
   run_oss "$market" ls "$prefix" --recursive --short-format \
     --max-age "${max_age_seconds}s" >"$listing"
   while IFS= read -r line; do
@@ -919,6 +942,7 @@ jq -n \
   --arg finished_at "$gate_finished_at" \
   --argjson required_duration_seconds "$REQUIRED_DURATION_SECONDS" \
   --argjson requested_duration_seconds "$gate_seconds" \
+  --argjson health_settle_seconds "$health_settle_seconds" \
   --argjson duration_seconds "$duration_seconds" \
   --argjson test_only "$test_only" \
   --argjson checks_passed true \
@@ -931,6 +955,7 @@ jq -n \
     started_at:$started_at,finished_at:$finished_at,
     required_duration_seconds:$required_duration_seconds,
     requested_duration_seconds:$requested_duration_seconds,
+    health_settle_seconds:$health_settle_seconds,
     duration_seconds:$duration_seconds,
     test_only:$test_only,checks_passed:$checks_passed,
     production_eligible:$production_eligible,passed:$passed,markets:$markets}' \
diff --git a/deployment/aliyun/test-rust-lob-control-plane.sh b/deployment/aliyun/test-rust-lob-control-plane.sh
index 23e95e05c..941d39440 100755
--- a/deployment/aliyun/test-rust-lob-control-plane.sh
+++ b/deployment/aliyun/test-rust-lob-control-plane.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Dynamically sourced production functions consume fixture globals and mocks.
-# shellcheck disable=SC2016,SC2034,SC2317,SC2329
+# shellcheck disable=SC1090,SC2016,SC2034,SC2154,SC2317,SC2329
 set -euo pipefail
 
 SCRIPT_DIR=$(cd -- "$(dirname -- "$0")" && pwd)
@@ -45,7 +45,23 @@ grep -Fq 'fewer than two replay-safe complete OSS manifests' "$GATE"
 grep -Fq 'replay-unsafe manifest before a later replay-safe manifest' "$LIB"
 grep -Fq 'install -d -m 0750 -o "$SERVICE_USER" -g "$SERVICE_USER" "$segment_dir"' "$GATE"
 grep -Fq 'manifest_sha256:$manifest_sha256' "$GATE"
+grep -Fq 'readonly HEALTH_SETTLE_SECONDS=2400' "$GATE"
 grep -Fq 'readonly MAX_HEALTH_SILENCE_SECONDS=120' "$GATE"
+grep -Fq 'MONDAY_TEST_HEALTH_SETTLE_SECONDS' "$GATE"
+grep -Fq 'short health settles require a test-only gate' "$GATE"
+grep -Fq 'test health settle duration is too large' "$GATE"
+grep -Fq 'MONDAY_TEST_HEALTH_SETTLE_SECONDS < HEALTH_SETTLE_SECONDS' "$GATE"
+grep -Fq 'health_settle_seconds=$HEALTH_SETTLE_SECONDS' "$GATE"
+grep -Fq 'settle_deadline=$(( $(monotonic_seconds) + health_settle_seconds ))' "$GATE"
+grep -Fq 'max_age_seconds=$((gate_seconds + health_settle_seconds + 3600))' "$GATE"
+[[ $(grep -Fc -- '--argjson health_settle_seconds "$health_settle_seconds"' "$GATE") -eq 2 ]] || {
+  printf 'run and final gate evidence do not both record the effective health settle duration\n' >&2
+  exit 1
+}
+[[ $(grep -Fc 'health_settle_seconds:$health_settle_seconds' "$GATE") -eq 2 ]] || {
+  printf 'run and final gate evidence do not both expose the effective health settle duration\n' >&2
+  exit 1
+}
 grep -Fq 'and .all_symbols_bridged == true' "$GATE"
 grep -Fq 'and .bridged_count == .symbol_count' "$GATE"
 grep -Fq 'and .snapshot_only_symbols == []' "$GATE"
@@ -100,6 +116,43 @@ done
 tmp_dir=$(mktemp -d)
 trap 'rm -rf "$tmp_dir"' EXIT
 
+health_settle_body="$tmp_dir/resolve-health-settle.sh"
+sed -n '/^resolve_health_settle_seconds()/,/^}/p' "$GATE" >"$health_settle_body"
+resolve_health_settle() (
+  HEALTH_SETTLE_SECONDS=2400
+  gate_seconds=$1
+  test_only=$2
+  MONDAY_ALLOW_SHORT_GATE_FOR_TESTS=$3
+  MONDAY_TEST_HEALTH_SETTLE_SECONDS=$4
+  die() { printf '%s\n' "$*" >&2; exit 1; }
+  # shellcheck disable=SC1090
+  . "$health_settle_body"
+  resolve_health_settle_seconds
+  printf '%s\n' "$health_settle_seconds"
+)
+[[ $(resolve_health_settle 1800 true 1 60) == 60 ]] || {
+  printf 'authorized short health settle was not applied\n' >&2
+  exit 1
+}
+[[ $(resolve_health_settle 1800 true 1 '') == 2400 ]] || {
+  printf 'test-only gate without an override did not keep the formal settle\n' >&2
+  exit 1
+}
+for fixture in \
+  '3600 false 1 60' \
+  '1800 true 0 60' \
+  '1800 true 1 invalid' \
+  '1800 true 1 2400' \
+  '1800 true 1 2401' \
+  "1800 true 1 $(printf '9%.0s' {1..100})"; do
+  read -r fixture_gate fixture_test fixture_auth fixture_value <<<"$fixture"
+  if resolve_health_settle "$fixture_gate" "$fixture_test" "$fixture_auth" \
+    "$fixture_value" >/dev/null 2>&1; then
+    printf 'invalid short health settle fixture was accepted: %s\n' "$fixture" >&2
+    exit 1
+  fi
+done
+
 safe_candidates="$tmp_dir/safe-candidates.tsv"
 unsafe_candidates="$tmp_dir/unsafe-candidates.tsv"
 printf '100\t200\tsafe-1\n200\t300\tsafe-2\n' >"$safe_candidates"