Your personal dive log is just that - personal. You can count whatever you choose as a dive. My diving group feels that amount of time in the water is more important than number of dives. As a result, we don't consider it a loggable dive unless the dive is at least an hour, or has some specific purpose.
So let me ask a question, what happens to all those hours in the water that were less than an hour-long dive? You can do a lot of 45 minute dives that will certainly count towards a total "amount of time in the water" but wouldn't count as dives for your group.
As for specific purpose, that's simple. Diving!
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