If you are being legally detained per reasonable suspicion then you can be detained as long as is reasonable to satisfy the investigation.
Something gave them a reason to detain you guys and conduct an investigation . Any time you are lawfully stopped and detained you are not free to leave.
If it is a consensual encounter then you can simply walk away at anytime.
There are many factors that can justisfy a detention. If you'd like to lay out the whole scenario then I'd give you my opinion.
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