New Day

Each "game day" is eight real hours long, making three game days per real day. When a new game day starts, you will regain all reiatsu, regain full hitpoints, your mount will regain full rounds, if you're dead you will be resurrected, and you will gain your full turns (plus any extras you receive from mounts, etc).

You have a game day countdown bar under your "personal info" on your right hand side. It shows how much time is left until the next new day.