I voted for even numbers like 2:00 or 3:00 or whatever. We have a button that automatically sets the timer for 1 minute, so you can just press it 3 or 4 times or whatever.
I never do odd numbers unless it is my daughter's milk which is always 1:05 and it's the perfect temperature for her but aside from that I usually do 3 or 3:30 or for the rice I do even numbers like 18 or 20 or 22...lol