Why does he keeps the conversation going like for an hour or so?

[Rhythm1]

Like we are texting and when I'm about to say bye, he brings out a new topic

[Summeroflove]

Some are just talkative. There are some people I can never get off the phone. Even if there is a absolutely emergency they still wanna talk.

One in particular I have had to hang up on a few times. Lol.

Most aren’t that bad. Family, friends, and others who sometimes just like to talk your ear off. I am guilty too though. But when someone says bye or starts to wrap up the conversation usually I get off the phone

[spartan55]

Yeah, and you'd be bitching if he gave one word answers and dry texting you too.
Further evidence girls are NEVER happy.

[SnowedIn]

Because he wants to stay connected to you and keep talking.

[In_Trance]

have you asked him why?