Jimmie76, you beat my record ... I think my best was about 15 minutes, clicking buttons and sounding like a confused old bloke [as usual] before getting bored and admitting I use a Mac
My record was 3 calls in one day. "Oh, hello again. And how are the kids? I could hear them in the kitchen when you called earlier, shouting at their mother."

They haven't called me for ages, but they are also believed [according to some reports I've seen] to be doing silent nuisance calls from 001-888-979-2362. Answer, and they hang up. Fortunately my landline handsets enable call barring, so I don't hear from them any more.