Charak Samhita
प्रयोगः सप्तसप्ताहास्त्रयश्चैकश्च सप्तकः। निर्दिष्टस्त्रिविधस्तस्य परो मध्योऽवरस्तथा ॥५४॥
The method of use is threefold viz. for seven weeks, three weeks and one week regarded as maximum, medium and minimum.
english translation
prayogaH saptasaptAhAstrayazcaikazca saptakaH। nirdiSTastrividhastasya paro madhyo'varastathA ॥54॥
hk transliteration by Sanscript