JJ is right and also its always better to pace yourself in the beginning.
Instead of playing 6 hours in one day and having sore fingers for 2 days (where you wont be able to play that mutch), it better to play 2 or 3 hours each day and be able to play everyday.
Eventually, your fingers will be like rock and your muscle will have developped and you will be able to play 6 hours a day, everyday.