I have been taking stimulants for about 3 to 4 years. The majority has been generic Adderall at a dosage of 30 mg, but before being regulated I tried various dosages of this, Vyvanse, Adderall XR slow release, Ritalin, and probably some others. There were a few breaks within this time period some of which lasted 5 to 6 months. In the first couple years I did not take it daily either. Now, for about the past year I have been prescribed 30 mg of generic Adderall. I take it almost daily. Occasionally I split the tablet and may or may not take the other half in the afternoon. I was wondering if anyone knew how long it would take for my tolerance to decrease? Also, would splitting the tablet and taking one half in the morning and one half at night have make improvement? I was thinking that because I am not receiving the dosage all at once then my tolerance may decrease a little. Anyone have experience with this issue?