As long as they deem reasonably necessary given the circumstances. I suppose it is possible for an officer to stop traffic for such a length of time as to be an abuse of the officer's discretion, although I have no clue as to what a driver's remedy would be in such a situation.
As long as it takes to deal with the incident. School shooting, traffic incident, collision, rabid animals, parental custody conflict? Hopefully, a flat tire should be dealt with promptly.
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