Three months isn't impossible! But it depends on a lot of factors. I managed it in that time period but I had exclusive access to an aircraft and instructor. I did it over the winter period and never had any issues with the weather. It was cold ( very cold even) and the aircraft I was using had no heater but the visibility was fantastic.
We didn't have the kind of weather that seems to exist now - low stratus clouds and so on. Having seen some of the recent weather, three months may be optomistic. That would be true even in the south of France...