diff --git a/scripts/e2e/parallels-windows-smoke.sh b/scripts/e2e/parallels-windows-smoke.sh
index dfc4aa5b428..a7799cd3e86 100644
--- a/scripts/e2e/parallels-windows-smoke.sh
+++ b/scripts/e2e/parallels-windows-smoke.sh
@@ -51,7 +51,7 @@ TIMEOUT_ONBOARD_S=600
 TIMEOUT_ONBOARD_PHASE_S=$((TIMEOUT_ONBOARD_S + 120))
 # verify_gateway_reachable runs six 30s probes plus short retry sleeps.
 TIMEOUT_GATEWAY_S=420
-TIMEOUT_AGENT_S=600
+TIMEOUT_AGENT_S="${OPENCLAW_PARALLELS_WINDOWS_AGENT_TIMEOUT_S:-900}"
 PHASE_STALE_WARN_S=60
 
 FRESH_MAIN_STATUS="skip"