On this topic I would respond thus based on my experience watching others and extensive conversation with other gamblers
1. If you notice you are getting addicted to gambling, if you can control yourself to stop for some days, it is still in the earliest stages where you can easily quit on your own. If not, talk to your best friend to help you out. They don't need to be a therapist, they just need to care about you.
2. Addiction can last for several durations, depending on how soon you notice it and decide to take action against it. Gambling addiction will persist for a longer time, if you choose to continue to live in denial of it.