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A refresher in the pool or in "pool like conditions" would be time well spent.
For the second part of the question, its very much a sliding scale that depends first off on how good the divers skills were to originally! Some divers are so bad that no amount of time off will make them worse.
Many good and frequent divers will notice some slipping of their skills if they've been dry for as little as a month or two and will spend the first dive or portion of a dive fine tuning themselves. To an outside observer they might look fine, but someone who has really good skills knows whether they are really "in the zone" or not.
If the diver in your question was previously able to descend gracefully and become neutrally buoyant at any point during the decent, do a reg recovery and mask clear while holding position in the water column and then ascend in the same controlled manner, then they might only need some play time in the pool. If they weren't at this skill level before hand, they aren't going to get there without some guidance.
When in doubt, err on the side of caution. You only get to be wromg once.
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