Normally the game prevents you from wearing skates inside, but if you put them on right before you enter a building it is possible to have them on inside I am convinced that it could be useful to save time in a few places: where you either don't go far enough that putting on the skates is slow, or when a building has enough movement inside that it would be better to be wearing the skates. In general if you leave a building while wearing skates you don't have to put them on again outside.

in some situations the animation is longer than the distance though lol

happy runs! kutzu

I would find on average this wouldn't save time. It's a neat glitch but I could only really see it saving anything in longer buildings such as Limelight, or Chic salon in Paris.