diff --git a/firmware/controllers/bench_test.cpp b/firmware/controllers/bench_test.cpp
index afe57e36aa..e98cdf2e22 100644
--- a/firmware/controllers/bench_test.cpp
+++ b/firmware/controllers/bench_test.cpp
@@ -83,6 +83,11 @@ static void runBench(brain_pin_e brainPin, OutputPin *output, float delayMs, flo
 	int onTimeUs = MS2US(maxF(0.1, onTimeMs));
 	int offTimeUs = MS2US(maxF(0.1, offTimeMs));
 
+	if (onTimeUs > TOO_FAR_INTO_FUTURE_US) {
+		firmwareError(CUSTOM_ERR_6703, "onTime above limit %dus", TOO_FAR_INTO_FUTURE_US);
+		return;
+	}
+
 	scheduleMsg(logger, "Running bench: ON_TIME=%.2f us OFF_TIME=%.2f us Counter=%d", onTimeUs, offTimeUs, count);
 	scheduleMsg(logger, "output on %s", hwPortname(brainPin));