A few days are good to lower tolerance for a few days. A 2 week or longer break is even better.
Ive been a heavy user for 26yrs and it wasnt till i had a spell in hospital that i had my first break from it (23days) and when i went back to it, i felt like i was suposed to feel. From that experience i now take regular breaks from it. At least twice a year.Its definatley something i recommend.