I suppose it's pretty subjective where the OP's personal threshold is. But the only way you'll find your limits and balance is by pushing it, which it seems you have. Once you get the message and have enough to content to chew over for a while, stop and integrate. Trips are so different from one to the next, it's silly to think you'll gain more or hear the same message by rushing back into hyperspace.
I've had my periods of frequent use and after you know how to use it and in what context, a lot of the hype goes away, it becomes deeply personal and spiritual. Then you 'know' when best to do it and aren't just taking shots X amount of time. For me, I forget about it until I'm feeling very calm, relaxed and determined. Then I can focus on a perspective and answer many questions from it during the trip. Other times I just feel distracted and overwhelmed or caught off-guard.