If you are up to recording each then do so. If they are ever needed as prerequisites just have some extras in case they get prorated. Why alter reality for someone else's perception?
Pete
Pete
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20ft for 20 mins seems to be whats generally accepted as a dive... but it's your logbook, so you can do it how you want to. If it were me and I wanted to log that, I'd probably put a day's worth on the same page and I probably wouldn't number it. You say you'd like the credit for at least some of it; is that for prerequisites on future courses? If they're all really short and shallow, you'd probably have a hard time finding an instructor who'd count that towards prereqs. If it's just for yourself, again, log it however you want, it's your logbook.
It's your logbook, so you can log any dive you want to, but I wouldn't even consider logging a dive of less than ten minutes. It will pad your book for future classes, but you will always know you logged dives that really shouldn't count. I know a couple of divers who logged every descent they made during their rescue course. One of them even bragged about making a dozen dives one day. They were less than three minutes each.
The second was with my 10 year old daughter who just didn't feel up to diving after we had swum out to the platform and dropped to 15'.
With my daughter I learned that any one can call a dive at any time for any reason. Even if we just spent 1/2 hour driving to the lake, 1/2 hour gearing up, 10 minutes swimming to the platform. She was a trooper for having the courage to call it!