I have been going through my dive log and found a few dives where the depth could be 15-20 ft for 3 min is this logable? Or maybe 5-10ft for 6 min and so on. Should I disregard these dives?
Here's a slightly different way to view the criteria for logged dives.
You can put what you want in your logbook; however, do not confuse log entries with number of logged dives. Let me explain.
The scenario is this: You are looking for an instructor to help you earn your next certification. There are two possible candidates, but in the selection process you discover that one of them has a logbook full of dives to 5-10 feet for six minutes or so... would this make a difference to your final decision?