Our bodies normally take anywhere around 2-7 days to get into ketosis. Depending on your metabolic rate, level of activity, and eating habits, you could be one of the unlucky ones on the waiting list for the whole seven days. Or… You can simply follow the tips listed in this article, and get into ketosis in the minimum amount of time possible. Also, if you messed up with your ketogenic diet...
source https://www.shortcutketo.com/get-into-ketosis-in-24-hours-fast/