My 20 cranks for a few seconds before firing and I ride it to work almost every day. Doesn't sound like a long time but my CB1100 fired up instantly. I guess it doesn't matter as long as it starts but it does seem odd.....
Click the scroll wheel, scroll to the trip odometer you want to reset, click the scroll wheel again to reset it. Note that you can change what's displayed on each "page" in the configuration menu, and there are *two* trip odometers. (long click scroll wheel to enter).