hyrdro...
as for how long you will feel it... the first time i ever did it, i took only 20 mg and felt the good effects until late in the night... i knew i had to sleep cause i had school the next day and my mom would think I was a little weird if she heard me working out in my room at 3 in the morning, lol. The next day or two my body felt like shit though... sore all over (not a good sore like u get from working out), bad stomach cramps, and diahrea (sp?)...
when i moved to 30 mg i felt the good effects into the next day. it all just depends on your tolerance, etc. if u r still feeling the good effects then be happy and pray the comedown doesn't last as long as the good part did.
as for side effects...
after 45 minutes of taking it, i feel like i could go out and run (with high dosages, in the beginning i just felt "chill", lol)... feeling like you are shaking, but you aren't... LOSS OF APPETITE, LOSS OF SLEEP, and when i took it, i didn't feel nervous about confronting people about certain things which can be both good and bad. side effects are different for different people though... no desire to sleep or eat are really common though...
hope that helped 0; )