2 hour lessons twice a day
Unless you are including briefing, walk round and debrief two hours is too long for a lesson, after about 45 minutes you start to lose concentration.
I am amongst many that did a PPL on the Air Cadet flying scholarship, this was (meant to be)a four weeks intensive course, in fact due to weather it stretched to five, but immersed in the course like this I would say you actually get a better quality of training than a stretched out one where you are dipping in and out and losing continuity.