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Absolutely. New divers who don't dive regularly from the outset should do one. I think there may be a sliding scale as you get more --regular-- dive experience. I did my first post-OW dive after about 2 months. Longer than that and I may have forgotten stuff. "Vacation" divers may want to take a refresher (or just a local easy dive to review with an experienced buddy) fairly often.I think it depends on the experience of the diver. Someone who has a lot of dives under their weightbelt probably doesn’t need a refresher. Someone who gets certified then does little or no diving for awhile probably forgets lots as they never reinforced the skills they maybe weren’t so good at yet.