How adderal tolerance works?

I was prescribed adderall a while ago, i take a 30mg extended release and take it daily during the week. However on the weekend I don't find a need to take it. So basically when i get to about wednesday or thursday each week I have noticed that the overall benefits seem to subside. For example I don't feel the concentration boost, the increase in alertness or the slowing down in my thought process. I also do not get the sleep benefits like normal (I sleep better at night when I take the adderall). Over the while I have taken the medication It's slowly becoming more noticable on how its effects are decreasing. So im wondering how long does it take of not taking the medication for the tolerance to completely deplete, or does it ever even go away? Also is there any interaction between it being detectable in urine and tolerance or is it mainly just a neurological thing?