It varies a bit depending on their breeding but we have two in milk right now and get about 4 liters per day, milking about 12 hours apart. In total, the routine takes me about 25 minutes (get grain, wash and dry udders, milk, cover, then switch does and repeat). You might find a wider range of info on the on BYC's sister site, BackYardHerds.com if you have more goat questions.