Addiction doesn’t follow a one-size-fits-all definition, everything about it varies. Some people become addicted very quickly, and for others, the addiction is a slower process with substance use slowly crossing the line to substance abuse and then full-blown addiction.
For the best chance for a good outcome, try to find a time that you are in a good mood, and the person with the addiction is in a place where they are at least willing to listen. Don’t be disappointed if your first conversation doesn’t result in their willingness to get treatment for their addiction. But don’t give up.