Least I've done is 3, I think, on a good night. Usual amount would be 6 or 7, I think. Most I've done is 9, but of course it depends on the pill.
I realise some people might not consider this a healthy amount exactly, but 1 or 2 just isn't going to last the night, and anyway I usually enjoy the added effects that come with heavy and prolonged dosing - hallucinations, extreme short term memory loss, etc, etc.
Of course I suppose this comes at a price, and I have to admit that my honeymoon is obviously over and that
truly glowing experiences have recently been few and far between.
But I would still recommend to anyone who's used to doing just a few a night that they try going crazy at least once.
With more prolonged and heavier dosing the character of the drug changes and can be, IMO, a new experience in itself.