פירוש על ברכות 33:14

Since they are exempted from many religions duties incumbent upon men. See fol. 20 b, p. 132.

The reference is to the Schools at a distance from their homes. The classic example is that of 'Akiba's wife who induced him to leave her to prosecute his studies, and he remained away twenty-four years. See Ketubot 62 b.