Set some goals for the day. Stop when you've either accomplished them all, or when you don't feel like you can finish them anymore. Then set some more for tomor

Set some goals for the day. Stop when you've either accomplished them all, or when you don't feel like you can finish them anymore. Then set some more for tomorrow and go do something else. Alternately, when you've been in front of the computer for 8(ish) hours.