I was on it from the day they started the list several years ago. No calls except from my telephone or credit card companies and they only last a week or two depending on what ad campaign they're running. I NEVER answer the phone. I always let the answering machine get the call and if it turns out to be somebody I want to talk to, I'll pick up.
One other thing, it can takes six months or so from the day you sign up until the calls stop. Telemarketing companies only have to update their lists two or three times a year, so you may get calls until they get the latest update.