No set formula, but basically, the longer you stay down and the harder you work while down, the longer the surface interval. Of course, the deeper you go the more work to get back up. It takes about 4 minutes or so to fully recover from a fairly deep, moderately hard dive, more if you are really stretching. For me, 60 or less, 3+ minutes is about right. 90-100 4-5 minutes feels good. Much deeper than 100, longer. You will find that extending your surface interval will very likely extend the time you can dive.
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Connor
Last edited by cdavis; February 1st, 2008 at 00:54.
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