If it's never been tuned or regulated it might take more than one time too. Until it settles into its new home. I've had a few surprised people (an unpleasantly surprised of course) when they agree to tune their ancient piano that hasn't been tuned in years and then it takes a second tuning to get it to hold pitch. (Or worse, it takes a second tuning to confirm that no, the piano really can't hold a pitch anymore.)