Really? 30-40 minutes before workouts and I'm jacked halfway through.
BTW, I'm doing quick workouts pre-judo class. Today I slammed my NOS, hit the gym, and did alternating pullups and dips to failure, with 10 seconds rest in between, or whatever it took me to walk between stations. 5 reps each set.
Then I hit judo for 2 hours. Warmup is a nasty calisthenic fest for 15 minutes, then 20 minutes of practicing a technique, 15 minutes ground fighting, and 45 minutes full on stand up judo fighting. 5-6 minute rounds, back to back, no rest. I fought the female US Olympic bronze medalist from last year. Tore me up.
My honest opinion? There are better products for oxygen-debt/anaerobic exercise; but this stuff is very good for power, intra-set recovery, and aerobic endurance (not to mention pumps). I'd buy another tub right now to take advantage of the price, if I could afford it.