You can get a win screen against literally any opponent. The only way to prove your opponent is timing out is to take a screenshot of it. You'll notice 30 seconds in most of the time that someone is going to time out since no action past that point tends to mean a time out is imminent. At that time you still have 40 seconds to react. Most screenies will show anything from 1-3 seconds left since you don't need reflexes to just count down.