Which of the following is correct?
1. "The employee worked nine to ten hours per day."
2. "The employee worked nine-to-ten hours per day."
3. "The employee worked between nine and ten hours per day."
(1) and (3) are OK. I don't feel that the hyphens in (2) are really necessary.
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(1) and (3) are OK. I don't feel that the hyphens in (2) are really necessary.