Charak Samhita
अथास्याः प्रणयेन्नेत्रमनुवंशगतं सुखम्। द्विस्त्रिश्चतुरिति स्नेहानहोरात्रेण योजयेत्॥६८॥
Two, three or four unctuous enemas may be administered in a span of 24 hours. The varti (suppository) to be administered for elimination of basti medicament should be thicker than the enema nozzle.
english translation
athAsyAH praNayennetramanuvaMzagataM sukham। dvistrizcaturiti snehAnahorAtreNa yojayet॥68॥
hk transliteration by Sanscript