get you into almost any "recreational" dive site. As far as logging dives goes, there's no time limit on "when" you have to log them....of course, accuracy will suffer if it's been years since you did the dives! You might be able to reconstruct to SOME degree the diving you've done...looking at old work/vacation schedules, checks written to rent gear or whatever. Nobody's going to polygraph you about it...just don't be tempted to put down dives not representative of your experience. Around here (Guam) operators like to see an AOW or above card, but will sometimes take a logbook showing appropriate experience....and, realistically, an OW diver with 100+ divers is almost always better than an inexperienced but card-laden (AOW, rescue, etc) diver. Some people won't do a dive unless they can get a card out of it!
I'm at dive #4456 as of today...but haven't kept a paper logbook for many years...just put down what I need in my computer...guess I could print it out if there was ever a good reason to do so. On most of my "working" dives, it's "just the facts, ma'am"....date, location, depth, time & number of customers. As I've done some of the same sites hundreds (and one of them, over 1,000!) of times, there's not much reason to write down the same fishies over & over. On a "day off" dive, or looking for a new site, I'll include more detail, especially if I'm thinking of using it in the future for my customers....note where the different anemones live, topography, that sort of thing.
Chris (formerly signing in as "Iruka" until the website ate that name somehow)