Anandakanda 1.6.123

1.6.123

sparśavedhī tu vaktrastho dvimāsātsiddhidāyakaḥ /
śatakoṭistribhirmāsaiś caturbhir daśakoṭikṛt //

Transmuting by touch, held in the mouth, it grants perfection within two months; / within three months, it [transmutes] a hundred crores; within four, it makes ten crores;