We don't know how long it is nor does physical contact is needed when imbuing haki to an object. As we saw with the Kuja arrows it will stay there for a few seconds at least after the release. Same goes for bullets. if you imbued haki to a gun, you can imbued the bullets inside of it aswell since it's still part of the gun and still in physical contact.
Imo, you need physical contact in order to imbue haki to any objects.






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