[test1235]

Yeah - mental. You reach your maxes quickly and progression gets difficult because you're trying to do so much in a single session, but you don't need to think about other programs while you're still making progress with what you're currently doing.

The other thing for me was it started to take too long - I generally try to get my stuff done in an hour or so before work. I went from SL to GSLP to 531 (3 main lifts, to 2, finally to 1, per session).

To be honest, I don't think it matters too much - as long as you find something you like to do enough to stick to regularly, you'll improve in health and posture either way.

[mod]

I agree, stick with something.

I always found that I could get my lifts in in about 45 minutes. It can be slower with a partner if their weight is very different from yours, because you're moving weight on and off a lot the bar, but ours was small enough that it wasn't a major time concern.

Later I did it solo and my workout times were ~30 minutes for the quick day, and ~45 minutes for the long day. The long day being squat/bench/row, and I felt like my breather periods were very generous.