1. do you get deleted if you are inactive?
2. What is the time limit on inactivity?
3. If i am going on a month-long vacation, is there any vacation mode i can go to or will i get deleted?
1) No. The Admins don't delete accounts.
2) You are listed as "inactive" if you haven't signed in for at least 7 days.
3) There's no vacation mode. However as I said, you don't get deleted.