Turns out, I generally have to 'go' more often at a marathon than I do before/during my long runs. Probably adrenaline coupled with lower temperature at these runs coupled with being overly hydrated (better than the reverse).
I plan ahead. Even if I don't have to, I get in the potty line 45 minutes before race time. By the time I get to the front of the line, I have to go.
If I have to go during the race, I *TRY* to do it in the supplied porta-potties. Going on a tree/bush is only a last resort. I never ever ever pee on someone's lawn. It's gross, disrespectful, and in some races like Boston, it'll land you a ticket with a big fat fine.
As for the other kind of potty, (ahem), I get up early before the race and try to go way beforehand.
Last note - some people, especially beginners, won't drink as much before/during the race so that they don't have to stop and pee. For most people, this is a mistake. You need fluids. Drink. If you have to potty, then find a place and potty.
In my personal opinion, a great time isn't worth smelly, nasty shorts :-).
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