I'm beginning to think that this stuff might be BK-MDMA. I've personally rolled six times on it the past 1.5 months and only felt some minor tolerance, but nothing like what I read about MDMA tolerance (have to be absent minimum a month between rolls etc). I just ordered a test-kit to be absolutely sure. BK-MDMA is still fucking great though, especially if I can roll every two weeks and get the same effect.
It could be methylone indeed, which is most likely. On the other hand in the beginning when you just start out using MDMA it can seem like you hardly build tolerance to it too. At least that's what happened to my friends and me. In our cases tolerance built exponentially fast the longer we used the substance. In the beginning I could roll once every month or the occasional once every 2 weeks even and get almost full effect from the same dose. Tolerance built very very slowly. But now after many years have passed I have to space my rolls a minimum of 3 months or I get severe tolerance. 6 months if I want close to 0 tolerance. I know there are people on here that will disagree with me on this, as I've had this discussion before but that's how it happened for me. And I never really abused MDMA, I did some stupid stuff at some occasions but those are rare and far in between, so it's not an issue of abuse or overuse. When I started out I too thought I was the exception and that for some reason I only built very minor tolerance to MDMA even with frequent use. But over the years that changed...
More on the topic: I've had rolls of only 3 hours on tested and strong MDMA too, as it has been said before set and setting play a HUGE roll with this drug, even more so than most other drugs (except for hallucinogens maybe). Also other factors like: weight, how hydrated you are, how well fed you are, how full or empty your stomach is, mindset, other drugs, interactions with other drugs, certain pharmaceuticals or legal drugs, things like caffeine as a cutting agent, how well rested you are, how much you took (200mg doses tend to have emphasis on euphoria while slightly lower doses tend to favor empathy, euphoria overpowers the emphatic feeling in my opinion if you dose high), previous usage, hormonal balance in the body,.... all contribute to how long your roll is, how intense it is, how euphoric and emphatic it is and so on