§ 160. Hours to constitute a day's work. Unless otherwise provided by law, the following number of hours shall constitute a legal day's work:

1. For street surface or elevated railroad employees as affected by section one hundred and sixty-four, ten consecutive hours, including one-half hour for dinner.

2. For employees engaged in the operation of steam or electric surface, subway or elevated railroads where the mileage system of running trains is not in use, except those employees affected by section one hundred and sixty-six, ten hours, performed within twelve consecutive hours.

3. For all other employees, except those engaged in farm work and those affected by subdivision four of section two hundred twenty of this chapter, eight hours.

This subdivision shall not prevent an agreement for overwork at an increased compensation, except upon work by or for the state or a municipal corporation, or by contractors or subcontractors therewith, and except as otherwise provided in this chapter.