Oldgit, I believe that the best way to recover from overplaying is NOT to take a day off, but to alter your routine for a day or as long as you need to get back to where you want to be. Long tones, low register, play softly, concentrate on breathing. This is all important stuff anyway, and will hasten the recovery. Everything easy, easy, easy. This is how elite athletes recover from tough workouts; they don't take a day off, they alter the routine so that the body recovers faster. The only time someone should take time off altogether is if there is mental burnout. That's a different issue, although sometimes the physical and mental issues are intertwined which makes things complicated. I don't think you need to worry about that. As you said you're a beginner and are still finding your limits. So take it easy, keep playing, you'll be fine.