I usually follow my full session according to plan, only checking in halfway through to see if I'll play the last tournaments or not, depending on fatigue, the need to focus on other tournaments, or even just because I'm exhausted.
But I always play until the halfway point. For example, I start the session at 2:00 PM. Many tournaments last almost 8 hours, so theoretically, my session runs until 10:00 PM, so around 5:00 PM, I check in. If it's positive, I check in with everyone who's in the plan until 7:00 PM.
And one thing I think is most important of all is having a day COMPLETELY OFF POKER, to enjoy family and friends, and clear my head.