You might as well assume that it will take days. My DN always says that tablets take a couple of weeks to become established and about a month to go away if I am weened off them. Evidence suggests she is correct.
In addition, if I make a dietary change (I experiment a bit) it can take up to a week to go from here to there.
EDIT: Here is a picture of me drying out. Readings taken same time every day.
9.5, 7.7, 6.8, 6.8, 5.9, 5.3, 5.2, 4.7