Anandakanda 1.6.13

1.6.13

kuryāt tasyoṣmaṇā gātraṃ svinnaṃ dvighaṭikāvadhi /
evaṃ saptadinaṃ kuryāt svedanaṃ paramaṃ hitam //

By its steam one should make the body sweat for a duration of two ghaṭikās.
Thus for seven days one should perform sudation, which is exceedingly beneficial.