N.H. Rev. Stat. § 276-A:11
In addition to the prohibitions listed in RSA 276-A:4, III, IV, V, VI, and VII no youth shall be employed or permitted to work at manual or mechanical labor in any manufacturing establishment more than 10 hours in any one day, or more than 48 hours in any one week. No youth shall be employed or be permitted to work at manual or mechanical labor in any other employment, except household labor and nursing, domestic, hotel and cabin including dining and restaurant service operated in connection with such service, and boarding house labor, operating in telegraph and telephone offices and farm labor, or canning of perishable vegetables and fruit, or as a laboratory technician, more than 10- 1/4 hours in any one day, or more than 54 hours in any one week.
RSA 276-A:11
1989, 53:1, eff. June 18, 1989; 385:6, eff. Jan. 1, 1990.