I don't think you really should be finishing without enough time to look around and explore corners after the run except in rare cases. I often find 20-30 minutes left or more even on average runs so If I want I can go back and read stuff. The reason they have the timers is so instance servers don't get overloaded I imagine we've seen the results of that plenty of times. They give you adequate time unless you are having a terrible run but by that point you are probably flogging a dead horse anyway and would have abandoned.