What lasts longer Generic Adderall or Adderall XR?

Adderall XR lasts longer. The XR stands for extended release and lasts around 8-12 depending on the consumer, mg, & tolerance. Generic Adderall which is actually Adderall IR (Instant Release) only lasts for a few hours (about 4 depending on the mgs) because Adderall XR is made from 2 different "beads" which one type releases automatically n the other type releases in about 4 hours so in the end Adderall xr lasts about 8 - 12 hours. When you pay for the Adderall XR you are paying for the extended release feature. SO Adderall XR lasts longer than Adderall IR.