......Chris, that's rather debatable....most of the placed I've dove don't have dive time limits, but maybe you mean it's the 'policy' in Costa Rica ? I assume you've promenently disclosed your own dive ops dive time limits on your WWW site or verbally to customers BEFORE they book/dive with you ? I, for one, will NEVER book/do business with any dive op that limits dive times and/or does 'short fills'...I consider this to be outright theft/fraud/deceptive/unethical....it is a deal-breaker for me when 'shopping' dive locations/operations....you might be a nice guy, and the diving there might be good too....and you are certainly entitled to run your dive operation as you see fit, but I would never do business with your operation for this reason, so at least be honest enough to make sure your customers know, up front, that this is your policy.