I had surgery back in Mar, anesthesia affects are worsened by frequent cannabis use, and you don’t want to be over dosed. So they recommended (require) a 72 hour window of no cannabis use.

Wasn’t fun, but a the week after oh man I had to be careful with my bowl sizes.

It is. The time if takes for it to have a noticible effect will depend on the individual and their consumption habits.

I've been forced into one because I live in the Nordics and the contact I had no longer has access to it. I might be a very long time without it: (