It's not just rich people. Self-surrender/voluntary surrender is a reasonable thing for the courts to allow if they think you will show up. You can terminate your lease, store or sell your belongings, make arrangements for who takes your dog, marry (or not) your fiance etc. Better for avoiding recidivism if you can come back to things in stasis as opposed to restarting with nothing. The typical timeframe is around 2 weeks, but appeals might lengthen it.
I think it's fairly standard if you were released on bail prior to sentencing, but I don't have the statistics
I think it's fairly standard if you were released on bail prior to sentencing, but I don't have the statistics