The consultation time is from 6 p.m. to 9 p.m.
If you don't mind, I'd like to discuss something with you in private. Do you have a minute?
I consulted my doctor about my hemorrhoids.
A mutual discussion. Both sides are talking to each other and the feelings are mutual. Imagine you're discussing a problem. You want to get help with it, so you get some consultation from your friend. This discussion was very helpful.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.