240 hours. It is not regulated in which period these hours must be completed, but it can for example be done in 6 weeks by working full time (40h/week) or 3 months by working half-time. Please hand in a certificate (“Praktikumszeugnis”), stating the amount of hours or length of work period, specified as full time or part-time, to proof this amount. The field of work should be described, too.