Generally speaking, if you're going to experience side effects, they happen as soon as you start the medication. I've been on Abilify for a couple years now and I haven't noticed any side effects.
You can find a list of possible side effects here: http://www.drugs.com/abilify.html
I just read your other question, and I'm also on Wellbutrin XL with no noticable side effects. Hopefully you will be as lucky.
