How long does opiate withdrawl last?

[Spelvin]

Not sure why swim can't find a straight answer to this already on the forums, but anyway, it fucking happened, Swim has been using opiates recreationally for nearly 15 years resonsibly and sparingly but recently got fucking addicted after a few weeks of daily usage starting with semi-daily use of vicodin and/or methadone then heroin followed by about 3 weeks of daily use of poppy tea. Swim is in his second day of withdrawl, using kratom to ease the symptoms (not working as well as swim had hoped). Swim has heard from other addicts that withdrawl usually lasts 3 or 4 days. Is this true? Swim has been very serious about kicking as soon as swim realised he was hooked, how much longer does swim have to go through this?
thank you very much in advance to all who respond.