How could it become useful? Why is it so hard to accept that you can enter with a maximum of 120 minutes? Is it really so difficult to remember how much time you entered with? It just seems to me that you are wanting to remove something that's a minor inconvenience at most, even when you say it doesn't affect you. Is that really something you want SE to spend time on - different things that a handful of people find inconvenient but aren't affected by?