If after being pulled over taken to the police station taken to the hospital for blood alcohol level back to police station and then released how long do the police have to file charges?

the police have 24 hours to keep you without charging you after that they have to let you go or as i say charge you

In Illinois, we have up until the court date to charge you with DUI. The results of the blood test can take days if not weeks to get back to us.