Police arresting suspected prostitutes, taking them to church

[Mosby]

90. Here

How long can police keep me in custody before charging me?

If you are in custody because police suspect you have committed an offence, police may keep you in custody for a reasonable time to investigate the offence, question you about it, carry out searches and decide whether to charge you. In deciding what is a reasonable time, a number of things may be considered, including things such as:

the time required to transport you to a place where you can be interviewed properly
the need for you to receive medical treatment
the need to let you recover from the effects of alcohol or drugs
the number of offences and how complicated they are
the need for police with special knowledge to travel to attend the investigation, and
the need to interview witnesses or other suspects.

Apart from this reasonable time limit, police must also ensure that they do not keep you in custody for more than six hours, unless they get the approval of a senior officer. If they get approval, they are then allowed to keep you in custody for no more than another six hours, making a total of twelve hours. After twelve hours, police may only continue to keep you in custody if they get approval from a magistrate.

http://www.legalaid.wa.gov.au/InformationAboutTheLaw/crime/securityOfficers/Pages/Policepowerstoarrestanddetain.aspx

In a lot of states its longer, 48 to 72 hours.

http://blogs.findlaw.com/blotter/2012/07/how-long-can-you-be-held-without-charges.html