hi there
i agree with everyonelse you can't set a time limit... but i know consistency is the KEY ...so many times i have started it up, only to fall off the wagon, and than start back up again.

i think to really see the effects it has to be a lifestyle change and a long-term thing.

some say mindfulness meditation can take up to 6 months, but again everyone's brain is wired differently.

good luck and keep at it...