noun
long-winded speech; lengthy talk
Refers to a speech or talk that is unnecessarily long and tedious.
彼の長口上にはうんざりした。
I got fed up with his long-winded speech.
長話 refers to a long conversation or chat, while 長口上 emphasizes the tedious, drawn-out nature of a speech or monologue.
Compound of 長 (long) and 口上 (oral statement, speech).