(1) All persons sentenced to the penitentiary shall be kept at labor or at school when in sufficient health.
(2) The work of inmates shall be generally from six (6) to eight (8) hours per day during regular work days throughout the year and the number of hours to be worked in the different seasons of the year shall be regulated by the commissioner of correction. For purposes of this section, any hour an inmate attends school each day shall be credited to the hours the inmate must work each day.