Night over water hoisting? Only with an auto hover system or serious drugs. Then again we used to do it in the Huey (on drugs with auto gibber from the crewman
). Never tried it on NVG.
For currency, we used once every 90 days and given the difficulty of the operation (without the autohover), I think this was bare minimums until you built up heaps of experience. No idea what may be appropriate on autohover equipped systems. Try someone from the Oz Navy - they still do it, and even performed night rescue hoists during the Sydney to Horbart Yatch race disaster in appalling conditions.