For ME work, having 3 people working out, one right after the next is optimal. Don't rest too long, you wanna feel fatigued moving up and you'll get used to it soon enough.
For accessory work, it's you go - I go, one right after the next. Not only are you building strength and targetting your weaknesses, you are working on your GPP as well. Chuck V. is epitomy of this philosophy, it increases your work capacity over time and you will not only get strong but get your ass in shape as well.
A typical workout should take about an hour, more than that most of the time, but it's a gauge to keep your ass moving.
Hope this helps.