Don't make players have to press a button to skip a common long animation, it's annoying, and easy to miss. Instead, consider a "short animations" toggle in the options menu, like Final Fantasy X had for its summons. When enabled, animations are played fully the first time, but on subsequent times, greatly shortened versions are played. For the save station, this could be a sped up version of the opening and closing, perhaps with the steam puff frames cut out (they'd look silly sped up xP).