noun, noun or participle which takes 'suru', intransitive verb
long talk; long conversation
Refers to a talk or conversation that goes on for a long time, often with a nuance of being excessive or tiresome. Can be used as a noun or with する to mean 'to have a long talk'.
彼と電話で長話をしてしまった。
I ended up having a long talk with him on the phone.
会議の後で長話
Let's not have a long talk after the meeting.