What Would a Pro Do?

I use Hi-Opt, and my betting range is from 1-24 units (2 hands of 12). I average 4units/hour. If I am up 80-100 units within 2 hours, is it time to go? I play at this casino 2-3 times a week. It's the only casino in my area. I have not received any heat with my spread thus far. I want to be able to return to this casino, so I hide my chips when I am up, and leave when I am up so much in such a short period of time. 6 hours in one day, or 3 hours in 2 days of gambling should give me the same result, but I am human, and it feels great to leave with such a profitable session. Also, if I am down 80-100 units, and I return to even, I gladly hit the exit door. I use blackjack as a second income, even though it take me 75 minutes to drive to this casino. Should I stay, or should I go? What would a professional do?

Play on as it's a continual game but I must admit you're way is certainly meritorious particularly as to a pschological point of view.

...that you don't get heat after an 80-100 unit win! I'm usually gone at about 25 units, if I'm so lucky as to win that many in one session of reasonable length.

I was exactly in the same situation a few days ago when I was up $7000 after 3 hours of play in a casino where I planned to stay for three days (2 hours car drive).
I thought: The only reason to stay is to win more but this might lead to a point where the management would review it's very generous policy (at least 83% penetration).
Finally I decided to stay because I had already booked the hotel room as well as for private reason.The following days brought just ups and downs without any additional gains in the end.
I don't think there can be a general answer to this question.
You have to decide case by case.
For a recreational player it is perfectly OK to leave when notably ahead in order to celebrate the event.These are the real highlights for a Blackjack player.
When behind, it's right to hang on provided you can take additional losses.

Francis Salmon

if you go it will be double.