Norhydrocodone is a semi-synthetic opioid that is a metabolite of hydrocodone, commonly used for its analgesic properties. It is less potent than hydrocodone and is often studied for its potential therapeutic uses and effects on pain management. As with other opioids, norhydrocodone can lead to dependence and has potential for abuse. It is typically not prescribed as a standalone medication but may be found in certain formulations.
Does hydrocodone metabolize to hydromorphine? No. Hydrocodone is metabolized to hydromorphone, norhydromorphone, norhydrocodone, dihydromorphine, nordihydromorphine, dihydrocodeine, and nordihydrocodeine. If you meant hydromorphine then yes. I believe it is possible for as much as 30% of hydrocodone to be metabolized to hydromorphone, but usually is much less.
How fast is fast? If you drink a lot of water in the days leading up to a normal urine test and drink a lot before the test you should test clean after 7-10 days. Don't use your first urine of the day for a test. It will have a higher concentration of opiates in it. If you have to take a spectrograph urine test your screwed for about a month. I know from experience.