The Compendium of Caraka 8.1.24

8.1.24

sāyaṃ ca bhojyaṃ parato dvyahe vā tryahe 'anuvāsyo 'ahani pañcame &vā/
tryahe tryahe vā+&apyatha pañcame vā dadyānnirūhādanuvāsanaṃ ca//

And food [is given] in the evening; after that, on the second day, on the third day, or on the fifth day he should receive an oily enema; / or every three days or on the fifth day he should administer an oily enema after an un-oily enema.