ながでんわ

ながでんわ【長電話】

a long [marathon] phone conversation [call].

～する talk [chat] on the (tele)phone for a long time.

●彼女にかけるとついつい長電話になる. Whenever I call her, it turns into a marathon (phone) conversation. | Every time I phone her, it ends up being a long (phone) call.

・娘の長電話にも困ったものだ. My daughter's marathon telephone conversations are a terrible nuisance. | I don't know how to handle my daughter's long phone calls.