Hello @Rosa154,
Not sure exactly what the questions are, but I will do my best..
1. When you pre approve a guest, it give the guest the option to book within 24 hours. They do not have to, though. After 24 hours, you will be asked in you want to pre-approve again for another 24 hours; that is up to you.
2. Security Deposit - not really a S.D. Airbnb doesn't really collect the money up front. It seems to be a little fuzzy on how to collect this if need be. You would need photos of damage and to make the claim on the deposit (or portion thereof) within 24 hours.
3. Payout is made by Airbnb 24 hours after check in (usually a bit less than 24 hours really). It usually reaches your account a business day or two after that.
4. 24 hours, as I stated above.
5. Hope this helps!!