Do as much as it takes or as little sets you can get away with. Some days it takes more. Some days you just won't get there cause of distractions or diet / water consideration, rest, stress...etc
i can usually tell if it's not going well by the second exercise. And i will ditch the whole gd thing and do calfs, abs and rear delts. I can always get pump there. or find a milf to eye molest while in doing some stair master. Sometimes I get on the stair master for like 10-15 mins and i get back in the mode and return to by workout.
Ive done upwards of 25 sets on certain things. I know that sounds retarded but Stims+mania+Tren is a helluva driving force.
ummm, nowadays i stick to 8-12 sets in my 65-90% range. Warming up and finishing off with 50% range stuff, in the high 20's or even 30 rep range. Variety is the key for me. I get bored as fuck if i dont switch things around now and then.
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