4 hours and 37 minutes -- weird considering i signed up so long ago. i guess i don't post that often.
It may have something to do with activity too .... you can spend 30 mins reading a whole page in detail and if you don't then click on another link (so just close the window or go afk) it totally disregards ur time spent on that page
Maybe why many people with time spend reading posts rather than replying would seem to have less time spent online
Handy to at least click to the page before after reading a page if you want your time to always count
Definitely encourages ppl to be more extroverted and "spam" replies hehe