at most once is likely enough

draft-ietf-quic-recovery.md

@@ -666,7 +666,8 @@ it may assume some or all of the server's Initial packets were lost.
 To speed up handshake completion under these conditions, an endpoint MAY, for a
 limited number of occasions per each connection, send a packet containing
 unacknowledged CRYPTO data earlier than the PTO expiry, subject to the address
-validation limits in Section 8.1 of {{QUIC-TRANSPORT}}.
+validation limits in Section 8.1 of {{QUIC-TRANSPORT}}. Doing so at most once
+for each connection will be adequate to accommodate common loss scenarios.
 
 Endpoints can also use coalesced packets (see Section 12.2 of
 {{QUIC-TRANSPORT}}) to ensure that each datagram elicits at least one