I had my first flat the other day. Fortunately, I had practiced just a week earlier at home and was comfortable swapping the tube and using the CO2 out on a ride and was able to get home without problem. I'd ridden over some glass a couple blocks earlier (didn't see it until too late) and, while on the side of the road, I tried looking for the puncture, both on the tire and the tube, but couldn't find anything. I haven't had the opportunity to check the tube again, but will soon. The tire and new tube are holding pressure just fine.

Not being able to find the puncture has me wondering...Just how soon would a tire puncture and deflate if I pinched it? Would I know rather immediately or could it stay inflated for a significant amount of time? Could I have possibly pinched it when practicing and then, a week and 3 rides later, had it go flat?

Probably a dumb question, but as I said, this is my first flat, and I've only replaced the tube twice (including my practice). I'm clearly still learning.