Visa lapse on leaving Germany for a while

Hello,

I'm just wondering if anyone knows how long you're allowed to be out of Germany
before your visa lapses? I've got a student visa (Aufenthaltstitel) valid until
07/09, and want to have a holiday somewhere else in the EU for 2 months over the summer,
will my visa lapse in that time period? Anyone know the maximum time limit?
Can't find anything online...

THANKS!!

Maybe... Contact the Place where you got it and ask them, they would know the most current rules on that.. Not TT