Qs on time limit on Arriba / OTC, bar fines ..

I had girls telling me they can't stay for more than 30min
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Unless you negotiate for more time arribas will be 30 mins. Some PLs get lucky with extra time. Sometimes she might stay a bit longer to shower and clean up. Sometimes she's tired and wants to take a nap. But usually 30 mins for a standard arriba price.
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For OTC hookups, is there any bar fine or time limit if arrange with TB/HK girl off the clock at your Rizo/Cas roo
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Probably not. I've had my ATF visit both Rizo and Cas OTC in recent months and they let her in without a bar fine. But, be warned, it's sketchy. They used to charge a $300 bar fine for this, and ATF last trip warned me she couldn't be seen by meseros or they would assess it. I think for this and other reasons, if you're going to do an OTC TLN it's better to have a hotel outside the zona.
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If there's one thing about the rules at BT/HK, it's that they're inconsistent.

yes 30 minutes is the normal arriba time. but even without negotiation before taking her up I've had some girls stay up to about an hour with no problem. if the chemistry is there most of the time they stay until the knock on the door and not charge me extra for the extra time.
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the way I describe the policies of HK and tropical and Cascada and Rizo hotels is inconsistency is consistent here in Mexico.