@DKJoeAgain now that I think about it, it has been more like 2 months, but even so I tend to respond quickly to supplements. Usually, the way I've done it is I add on something, wait several days to feel what the effects are, and assess. The effects seem to plateau after that so that's how I've been able to assess them.
For the pyrucet, the carb burn effect isn't really something you feel but rather something you observe. So although I might have felt a little warmer in the midsection (due to faster digestion of things like orange juice) the end result is that I feel hungrier and hypoglycemic much earlier than if I had not taken the pyrucet. It was shocking how much earlier it was at first but now I've gotten used to it. And you can tell the carbs were burned, because you feel no more bloating than without the pyrucet with the same amount of carbs.