Synesthesia is a real thing, luco. Why you gotta be such a fish?

Per OP: I try to set the goal to play a certain amount of time, but I'm constantly reassessing that goal. As has been pointed out, making good decisions is the way to winning. If I'm playing poorly, then playing more hands is only going to hurt me in the long run. If I'm playing well, then stopping at a given time is also going to hurt me in the long run.

Never set monetary goals in poker... benchmarks, sure, but not goals. You can only control whether or not you make good decisions, and good decisions do not immediately translate into monetary winnings. Likewise, bad decisions do not immediately translate into losses. If you attach goals to things you can't control, you are setting yourself up for disappointment.