When I get heavy into weed, it's like 3-5 times a week. Mostly just don't do to many full day trips and you should be fine. If you feel lethargic the day after then maybe ease up a bit.
Basically listen to your body and don't treat it like a crutch from like a bad day or whatever and you should be fine.
I got a friend who basically smoked 3-4 times a day for like 15 years and he's a bit fried.