My intention was to get through PPL in a month, or at least ASAP. In the end it took over 2 months due to the bloody British weather. In fact, at one stage, I went for two weeks without a lesson, despite being available 24/7! You cant take anything for granted in this game.
I certainly agree with the comments regarding Navexes, you just can't 'take' more than one a day. One every two days is better to give yourself time to 'digest' and recover. The instructors tend to put you under a lot of pressure at this stage (pays off in the long run) and having several things to do at once takes its toll physically and intellectually, in short you will be f***ing knackered after a two hour navex!
Take it at your own pace, but dont rush it. You will be a better pilot that way, which it the most important thing at the end of the day!
Good luck, let us know how you get on.
Iain