How long does it take to become addicted to pacifiers:
I think it depends on how much you use it. I've been sleeping with a pacifier most nights for a few years now. Not every night, but 1-2 to 7 nights a week. I still don't depend on a pacifier to sleep most nights. Some nights I can't fall asleep without a pacifier in my mouth. Other nights I can't sleep with a pacifier in my mouth.
But I have days and nights when I really long for or need a pacifier to suck on if I have a panic attack, anxiety or feel sad, alone or little.