It defo exists although not sure over what type of time period it may last.
I trained a lot and gave up in around 2004-5 because I got bored of it. I started training again around 2008 and within 3 months I saw substantial gains again, then not long after got bored of it again and stopped. Im considering starting to train again so hopefully theres still some muscle memory there after about 7 years away from proper training