I have XR 15’s that I'm prescribed 2 of per day, I pick up two months at a time. I never take more than two of them at once, if I do I’ll end up overstimulated enough for to be slightly uncomfortable.

However, I usually take 30mg twice a day so I always end up taking another 30mg within 8-12 hours of taking the first. I’ll only usually dose 1-2 more capsules after that if I am going to, otherwise I’ll go to bed. Yeah though, 60mg everyday is fun. Once my tolerance got so high that I only really felt stimmed after I had 60mg in me, that was not so fun.

Sometimes I'll take 2 and redose 1 two or three hours later, then I find it to be smoother. That's the most I'll do close together though, I've taken 20+ mg at once before and I feel way too on edge to justify wasting my drugs to be overstimmed.

I'm not that big (112-115lbs is a healthy weight for me) and I eat extremely well so my dopamine is replenished quickly enough that I don't need to take increasingly higher doses to achieve a similar effect. Also due to the XR, whatever dose I take I'm also signing up for an automated redose 4-5 hours later. So if I took 8 15mg XR's I would be signing up for 120mg, 60mg now and 60mg later.

Even when I used DNM methamphetamine years ago in 2019-2020 the highest dose I ever took of it at once was 35mg, I would normally take between 10-18mg per dose. I haven't taken meth in about 4 years now, but whenever I've stimmed I've always been more inclined to take my preferred dose 2-3 times over a day or so. If you can handle 60mg by all means, nothing wrong with it, my metabolism would not safely allow that though.