I didn't mean you - shadow - but you as, you know, you. Does this sound better? "Sometimes when one has been training it makes sense to take time off from one's training....". It gets a little awkward. But I did read your post about using this situation hypothetically. I probably should have said "Sometimes when I have been training....", because I've been there and recently had an opportunity to take a vacation. All I wanted to do when I got back was work on some of the things that occurred to me when I wasn't actively trying to think about them.
One minor caveat, however, whatever the length of time you take off, be sure that it's not left open-ended. Take off a specific amount of time with the understanding that you will definitely return on such and such a day. Peace, Kage.