According to the official drug monograph, the half-life is 21 hours. It is "conventional wisdom" that it takes 5 times the half-life for there to be so little drug left, that it is, for all intents and purposes, gone from your system.

Thats 5 times 21 = 105 hours, or 4 days and 9 hours.

However, to account for how variable that 21 hour figure is, let's round it up to one week, to be sure.

Lar