How long does it take for permethrin take to start working?

Permethrin. Permethrin cream will kill the mites and their eggs within 8 to 14 hours. Permethrin cream rinse and lotion will kill lice and their eggs within 10 minutes.
One application. It used overnight and works within 8 hours. Itching can persist for days as the mites die off and may need to be treated with a prescription steroid cream.