ust.uss.clk.EventAfterDuration(returnSeatDemand, ust.uc.padDuration)
		returnTime = ust.uss.clk.Now()
	})
	now := ust.uss.clk.Now()
	ust.uss.t.Logf("%s: %d, %d, %d got executed=%v, idle2=%v", now.Format(nsTimeFmt), ust.i, ust.j, k, executed, idle2)
	if !executed {
		atomic.AddUint64(&ust.uss.failedCount, 1)
		atomic.AddInt32(&ust.uss.rejects[ust.i], 1)
		returnSeatDemand(ust.uss.clk.Now())
	} else if now != returnTime {