This relies entirely on the jail. You could expect to be released near-immediately posting bail, or it could take the better part of the day depending on where you fall in line with others also in the release process.
Your bail amount is decided by a myriad of factors as determined by a judge. This includes: the severity of the accused crime, previous criminal record, the perceived likelihood of additional crimes, the likelihood of fleeing, age, and so on. The less risk there is, the lower the bail amount and vice versa.
