I see no reason to do 'extended' hydrophone checks. (SH3 experience only, but isn't any different, imho) If you can't find anything the first couple of minutes, there's no reason to think they will appear the next 10 minutes. Sure they might. But then why not wait another hour, or a full day for that matter. Same probability. Seeing as your hydrophone coverage is limited, I suspect there is more gain to be had in scanning new unscanned area's of the map. As your initial listening position may just be outside of the traffic lane. Most likely your have better luck if you set up your listening points across a suspected traffic lane and move back and forth. Based on the size of your hydrophone coverage and expected target speed you can figure out how much time a target needs to cross that. Your interval should be lower so you will detect him the second time if he was just outside detection range the moment before.
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