In my opinion, most people new to flying cannot absorb enough new information and skills quickly enough to benefit from more than two or so hours of instruction per day. If your mind is sponge open, you might do a bit more, but certainly not so much flying per week as to complete a PPL in two. Many skills during the PPL are based on mastering the prior skill. If you run before you can walk well, you're going to stumble. At best, you muddle through, but do not retain the skills well, nor master them, It'll catch up at examination time, and either you'll be sent to retrain some skills, or simply fail a test. Others will have differing opinions, and each person's lesson absorption is different, but I suggest that you plan to receive ten hours of new instruction per week, be it ground or flight. In the middle of that, review, and if you can fly, just some skills practice, but limiting the new information, so you're not task saturated.