There's scientific study that was done about a year or two ago that tested the hypothesis if practice is necessary to retain piano ability. It was a little different in that they had 3 groups who all had the same level of practice coming in, one that practiced through the entirety of the study, one that watched videos of others practicing for a couple weeks in the middle of the study, and one that didn't practice or watch at all during the middle of the study.
Not surprisingly, those that did nothing got worse, but those who watched others practice actually retained their ability on a similar level to those who kept practicing. They reached a conclusion that, while muscle usage is important for dexterous tasks, watching sombody else practice seems to fire the same neurons that would be firing if you were the one practicing, strengthening the connections in the brain related to the skill. So while they might be slightly slower because their muscles haven't kept up, after readjusting they were often around the same skill level as those who were practicing continuously.
Reason I bring this up is because it's relevant for all physical skills. Once you learn the basics, you can maintain skill, and even develop it, over a short period of time by watching somebody perform that skill. Doesn't work over a long term, but it is an option for short-term hiatus. So watch them streamers and LCS games if you can't play one for yourself.