Just kind of a thought that pulls out is when does everyone get online on here? I have considered dating and timing my map's post but I do not know when would be the perfect time so, yeah... when is everyone online?
Well your post stays up as long as its the most recent to get a reply. So the time woulldn't make a difference. If anything, posting at peak times may make your map less noticed as your map quickly gets replaced by other peoples. In short, it won't really make a difference when you post, though if you still want to know, I'd hazard a guess at weekends around noon USA time, avoiding weekdays. OR evenings on weekdays.
Next time I plan on making a thread, which will be pretty soon "hint, hint", I will make a thread the night before I would like to post it and post the thread the first time I get to in the after noon, because i know people will be coming home from their jobs or school or grocery shopping or lord knows what and come here only to see a new map posted. Usually, if it's the first or second good map I see, I post a comment about it. Occasionally, I go on a commenting frenzy and comment up to 5 things in one period of time when I come home from doing something for a long time, but that's just me. BTW why exactly is this posted in Halo 3?