Overnight before i took them out in    Valotin   the morning so i don't have a repeat of what i had with the box freeze and it   actually really worked so not that much hair fell out whenever i would oil the braids at night and i kind of noticed that so that's why i just kept doing it and now i do it with my even my um wash day routine so hot oil treatment for pre-pooing you'll see a lot of length retention and moisture retention .