So..
obviously it depends on what kind of person you are.. do you do
well with self imposed pressure and can jump up and kick it out?
well, maybe 3-4 days of intensity can do it for you. There are folks
out there like that.
I'm not one of them.

.. I did a chapter or two a day out of
Gleims for my private, Jeppesen for my instrument, and did it over
a couple weeks. Again, get used to the questions, material and
a chapter a day seems to be good for a couple of hours of quality
time. Then go for a out for a walk and some fresh air. Key is
quality time though and focus on the subject matter. You will
begin to understand how the ask the questions and grok what the
nuances are in the questions - (what they are really asking, and
what they intend to trick you on.) For the PPL, don't skip on the
FAR's, weather and aero principles as that will be key, and also
get you sharp for your the oral test. Work through the math
problems so you understand what it takes to get what they are
asking for. Gleim and jeppesen are both pretty good at laying
that out, especially in the order of what it takes to get what piece
of info. And especially, don't stress out over it all. Its only a
multiple choice test, albeit it can be a tricky one for many folks.
You'll laugh, but I tried to explain principles of flight to my 7 yr old
at the time and it made me really understand what went on with the
forces.. my wife thought I was nuts.

. Then I did some weather.
My kid aced her weather chapter that year. Go figure.
so good luck with it all, let me know how it goes.
henning