What's the length of physical withdrawal symptoms from heroin, and which is worse-heroin, suboxone, of methadone-in terms of withdrawal duration and intensity?

1 week: Symptoms usually peak around day 3, then subside until sometimes 1 week. In terms of substance, it is difficult to say. Withdrawing from a small amount of heroin is much easier than a huge dose of methadone. I would say the dose is more important than the type of substance.

Heroin: Though people may think they get addicted to suboxone or methadone they are better than heroin . They are purer and mostly strictly prescribed and monitored by qualified addiction specialist doctors. They are very closely supervised. Withdrawals from heroin is the worst

There is no 1 answer: because there is enormous variability between people and all of these opioids (and others). However, in general heroin and other short-acting drugs produce a 5-10 day acute withdrawal, usually worst at 24-72 hours and is VERY severe&then improves, but a post-acute withdrawal which is milder but can last months. Buprenorphine is milder than methadone;both peak at 72 hours but can last many weeks.