I have played for 8 hours straight and 4 hours before that.... and i cant see any results on the top time playerboard here on the forums... i dont know what that means, if it is a bug or something i have no idea. but i can see other players time getting up and up all day but mine is stuck at 0. Happy for responds!
Sometimes it takes a while for the website to catch up so just wait it out, but it could be that 5 other players still have played more hours than you even after your play time today.
Staff probably fixed this, but Kane goes on minechat and Afk all day because you cant be kicked for afking on minechat.