How long does it take for the police to arrest someone for an FTA?

There is no set answer. If the FTA (Failure to Appear) warrant stems from a serious case the police are more likely to consider it a priority to find the person and serve the warrant. In lesser matters, the police are more likely to notify the person that a warrant has been issued and make arrangements for them to turn themselves in.

Some departments also have dedicated warrant service officers or teams who serve warrants all the time. Other departments have to prioritize more and are less likely to spend a lot of time or resources on a minor matter.