Mehr than once. My parents are actually those who usually suggest it (they're not irresponsible, they just know that once in a while, I need a Tag to relax, because with the homework, all my other activies and my stress to always get straight A's, sometimes I feel too pressured, at the point that it may harm my health).
Yeap. I did that a few times in my last Jahr of high school because I was working an accelerated course I had already technically graduated Von my Sekunde week back at school. I was only there to mop up some extra credits and focus on putting together a mappe, portfolio for uni, so I took days off to focus on uni prep and to just take an easy last Jahr after many years of hard work.
And I've taken days off Uni a few times for a particular paper where the information in each lecture gets put online anyway.
Yes I did after finals for the past three years. Mostly because we don't do anything after finals anyway. Then my parents make me go on the last Tag of school, and they let me walk out when I get my Berichten card. The last Tag is a 1/2 Tag in the middle of the week. What's even dumber is it goes Monday we have school Tuesday we have off then Wednesday is our last day. But yeah I have skipped school and walked out.