" - is equivalent to saying "But there is a limit how fast he can turn the crank". Correct? Yes.
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He can only do so much in a day.Why are you annoyed with him? He alone handles 12 animals at the farm! It wouldn't have been possible to run this farm without him all these years. And he can only do so much in a day. Now you want him to help you with other things. That's not possible.