Rasarnava 4.13

4.13

evaṃ tu tridinaṃ kuryāt tato yantraṃ vimocayet
taptodake taptacullyāṃ na kuryācchītale kriyām //

In this way, one should perform [it] for three days; then one should dismantle the apparatus.
[One should carry it out] in warm water, upon a warm hearth; one should not perform the operation when it is cold.