Split routines also offer the advantage that greater volume can be achieved for a given exercise (5 sets of 5 reps) within a reasonable time, and that workouts can take place on successive days whilst giving muscle groups that have been targeted the previous day a chance to recover. (startbodyweight.com)
With this useful information, you should allow at least 48 hours of recovery time before hitting a given muscle group again. (fitnessandpower.com)
By allowing 48 hours of minimum rest between training sessions for a given muscle group you «ll be well on your way to get the best results for to hypertrophy. (fitnessandpower.com)