I have about 300 750ml (25oz) bottles in my garage. That said, I only have about 193 of them full at the moment. So I have 145l (38gal). It all varies in age from more than a year to less than two weeks in the bottle. I put half of each batch in glass, half in plastic, drink the plastic ones from 1 month and the glass ones whenever I run out of beer in plastic bottles. I haven't been drinking that much recently though. I get a bit neurotic about saving the ones in glass!