I did about 6 hours a day in florida, but that was hard pushed. Got physically aswell as emotionally dried out after doing that much flying. You should be averagely aiming to do about 3-4 hours a day with regular breaks in the middle of each sortie to enjoy and experience the flying. But shouldn't be a problem to get 150 in about 3 weeks in good weather, and a very determined heart, but that fully depends on you.
Brian304