I have seen some people with mild WD after about seven days of use, but never anything like WD after just one or two days in my 14 years, when they had not been addicted before. Of course, if they had been physically addicted it's a whole different story. But that's just my own experience. Might be I don't klnow so many opioid users who don't use daily 
EDIT: actually I'd like to remind people that almost everything on the internet is just subjective experience. This topic might be harmless, but some things some people say, especially about drugs, can put your life at risk! Don't just believe everything on the internet, people. Very important.

EDIT: actually I'd like to remind people that almost everything on the internet is just subjective experience. This topic might be harmless, but some things some people say, especially about drugs, can put your life at risk! Don't just believe everything on the internet, people. Very important.