diff --git a/internal/expect.go b/internal/expect.go
index 2711c5dd..ff782503 100644
--- a/internal/expect.go
+++ b/internal/expect.go
@@ -2,9 +2,18 @@ package internal
 
 import (
 	"fmt"
+	"runtime"
 	"time"
 )
 
+var (
+	// Unfortunately, the resolution of time.Now() on Windows is coarse: Two
+	// sequential calls to time.Now() may return the same value, and tests
+	// which expect non-zero durations may fail.  To avoid adding sleep
+	// statements or mocking time.Now(), those tests are skipped on Windows.
+	doDurationTests = runtime.GOOS != `windows`
+)
+
 // Validator is used for testing.
 type Validator interface {
 	Error(...interface{})
@@ -227,13 +236,13 @@ func expectErrorEvent(v Validator, err *ErrorEvent, expect WantErrorEvent) {
 	if expect.ExternalCallCount != err.externalCallCount {
 		v.Error("external call count", expect.ExternalCallCount, err.externalCallCount)
 	}
-	if (0 == expect.ExternalCallCount) != (err.externalDuration == 0) {
+	if doDurationTests && (0 == expect.ExternalCallCount) != (err.externalDuration == 0) {
 		v.Error("external duration", err.externalDuration)
 	}
 	if expect.DatastoreCallCount != err.datastoreCallCount {
 		v.Error("datastore call count", expect.DatastoreCallCount, err.datastoreCallCount)
 	}
-	if (0 == expect.DatastoreCallCount) != (err.datastoreDuration == 0) {
+	if doDurationTests && (0 == expect.DatastoreCallCount) != (err.datastoreDuration == 0) {
 		v.Error("datastore duration", err.datastoreDuration)
 	}
 }
@@ -258,7 +267,7 @@ func ExpectErrorEvents(v Validator, events *errorEvents, expect []WantErrorEvent
 func expectTxnEvent(v Validator, e *TxnEvent, expect WantTxnEvent) {
 	validateStringField(v, "apdex zone", expect.Zone, e.Zone.label())
 	validateStringField(v, "name", expect.Name, e.Name)
-	if 0 == e.Duration {
+	if doDurationTests && 0 == e.Duration {
 		v.Error("zero duration", e.Duration)
 	}
 	if (0 != e.Queuing) != expect.Queuing {
@@ -273,13 +282,13 @@ func expectTxnEvent(v Validator, e *TxnEvent, expect WantTxnEvent) {
 	if expect.ExternalCallCount != e.externalCallCount {
 		v.Error("external call count", expect.ExternalCallCount, e.externalCallCount)
 	}
-	if (0 == expect.ExternalCallCount) != (e.externalDuration == 0) {
+	if doDurationTests && (0 == expect.ExternalCallCount) != (e.externalDuration == 0) {
 		v.Error("external duration", e.externalDuration)
 	}
 	if expect.DatastoreCallCount != e.datastoreCallCount {
 		v.Error("datastore call count", expect.DatastoreCallCount, e.datastoreCallCount)
 	}
-	if (0 == expect.DatastoreCallCount) != (e.datastoreDuration == 0) {
+	if doDurationTests && (0 == expect.DatastoreCallCount) != (e.datastoreDuration == 0) {
 		v.Error("datastore duration", e.datastoreDuration)
 	}
 }
@@ -328,7 +337,7 @@ func ExpectErrors(v Validator, errors *harvestErrors, expect []WantError) {
 }
 
 func expectTxnTrace(v Validator, trace *HarvestTrace, expect WantTxnTrace) {
-	if 0 == trace.Duration {
+	if doDurationTests && 0 == trace.Duration {
 		v.Error("zero trace duration")
 	}
 	validateStringField(v, "metric name", expect.MetricName, trace.MetricName)