Depending on the muscle grp I'll do 2-3 per groupe with set intervals of around 1 minute at the most, depending on the intensity. I'll take shorter breaks on cable row than military press, for instance.
And no, of course you should take a shower. Anything else is just gross, man
Aged 29, 6'6" (200cm), and 290 lbs/131 kg, 19% bf. Bit chubby, but hey. All bought and paid for, eh But then again, I only go once or twice a week, as I'm fine with how I am now.
Personal best bench is 340, but I only did two or three reps, and its a long time ago, so I probably can't do that any more. I do sets of 190-220, depending on my condition for the day. I did the 300+ at 23, I think, after 2 years in the gym. So that'd make it 6, almost 7 years ago.
Curl the 48 lbs and.. Not sure about the EZ bar as I don't really do that exercise any more, and I absolutely don't squat as the last thing I want is to gain mass on the thighs. That comes by default from being my height/weight, and I can barely find jeans as it is.
But really. Stop concerning yourself with what weight is on the bar, and focus on doing it right instead. You're young and probably still growing, so don't overdo it, seriously. Take it easy. And also, a 160 lbs guy should not under any circumstance attempt to lift 300 lbs with out plenty of training for it, and plenty of spotting. Instead, if you want to get involved with the numbers, look at what you do, relative to your own weight, and ignore the guys with their veins showing. No good will come of it.