When my kids were younger (daughter just barely talking), they used to love to talk on the phone, especially to grandma and grandpa. They didn't listen well on the phone but the talked (or babbled) at length. My wife and I would deal with telemarketers by handing my 2 year old the phone and telling them it was Grandpa, then walk away.
The thing was, my daughter would never know when the other party had hung up. She'd just keep going. In one instance, I had forgot I handed her the phone. about 10 minutes later, I noticed she was still on the phone. I assumed the telemarketer had long since given up. I took the phone from her and the sales person was still asking to talk to her mom or dad. I said, "Hello?". To which the lady asked if I was Mr. XXXXX. I said hold on and handed my daughter the phone back.
My sister in law is mental handicapped and LOVES to talk on the phone. She doesn’t always make much sense. One day when I was hot and sweaty from work, I got a call and gave it to her, then went and took a long shower.
After getting dressed, I noticed she was still on the phone, so I asked her to use the phone and sure enough they were still there. I gave her the phone back and it must have been close to an hour before she hung up.