Well... There isnt a super rule for that... You should bet how much you think they pay... If you know the limper is a super fish calling station, why not to make it 5x, 6x, why not 7x, how about 8x...
But if its not the case, you can just raise the limpers w/ AA the same way as if you had AK, JJ, KTs, etc... Use your standard...