It looks like the drug needs to be given soon after the noise exposure which is a shame. Most noise induced hearing loss in humans is cumulative in nature not a single assault.
Although they say it is best treated within 24 hours, extended expose will have benefits from it too.
“ADAC in particular emerges as an attractive pharmacological agent for therapeutic interventions in noise-induced cochlear injury in instances of both acute and extended noise exposures.”
Just how ‘long’ and extension tho, they don’t say.