Firstly, how long is each set on the main stage going to be? 20 minutes? an Hour? 2 hours? (I'm specifically interested in how long a guest act like Sabaton will be paying for, as thy will be the highlight for me)

what can i expect, as someone who has never been to a music festival of any kind, and has only ever been to one concert beforehand.

What tips and advice do you guys have?