Sometimes I can go 2 months without rolling, right now been doing it 3 weekends in a row cuz everyones back in town %) But it's quite harsh on the brain!
Once a month is the sweet spot.
I generally roll every 2-3 months, a bit more during summer due to festivals, but last month has killed me 3 rolls in 4 weeks =[

it was this for awhile. Started weekly then 2-3 months the last 3 year, and most recently 4 1/2 months and counting :D I did take a year off that ended about 3 years ago.It used to be every week.... but that changed and Ive been off it for almost 2 months now, so ill say once every 2-3 months
After 6 months of abuse (every 1-2 weeks) and suffering greatly from it, I spent about a year doing it every 8 weeks.
The last time I did MDMA was in May 2011. I intend to do it 2-4x a year, now that I'm more experienced and truly know how to appreciate it correctly. My next time will be for my birthday in a few months.