It honestly varies for people how often they can roll...
I rolled every week for over a year with no noticeable loss of 'magic' but became mentally quite unhinged from the serotonin drain. Switched to every other week and it was much better. Then I went to once a month and it was about the same as when I was doing it every other week... Now I haven't done it in over 3 years and I have no idea what to expect haha.
MDMA and MDA are amazing drugs just don't go crazy with them. How I never lost the magic (and trust me when I say that rolls are extremely magic for me - anyone that has ever been on here when I was rolling can attest to how fucked up I get) is beyond me but yeah, I paid in other ways (persisting panic disorder since 2005).