There are some people who can take 3 at once but they far and few between. We've seen that most of them are heavy thermo users and they're a little burnt out on them. There was one girl who could take 6 at once but she was coming off a 5 year speed habit.
Fuck that, ive been on and off stims for a few years now and i wont risk taking two at a time. 4 a day is what im at now, but am thinking about bumping it up (need to up the carbs though).