try it and see. start by breaking a normal day into two sessions basically each one being a half of what you normally do..you'll see how it impacts you pretty quick, for me, about a week. then start adding..
I just met a PL guy who does 10 extra sessions a week, with 4 of those heavy gym work. the balnce of these recovery sessions (higher reps, low load, little rest) or conditioning work but he swears it's the frequency that has kept him injury free.