I'm not sure I can give out exact numbers, but it's far in excess of what any single machine can push out, either practically or technically. Advertising it would be just as misleading as any other specific number. :)
>That's the limit (unless limited further by something else).
>... what any single machine can push out ...
That number wouldn't be very misleading, and could actually be useful - it's effectively the limit on a dumb fileserver. If their code results in a lower boundary, that's their fault, not yours, and not in the least incorrect because it's being restricted by them.