ALOT. Sometimes a whole pot before lunch. Sometimes just a couple of cups. After the night I had last night worrying about your last topic, I may have to drink 2 pots today.
I drink zero. My grandma drank a couple pots a day. They say too much coffee can make you crazy. No wonder why she said she seen Osama Bin Laden in claremore.
Back in the day when I had to work, I was doin' 4-6 cups a day when I was flying. Cut it back to 2 cups and found I could sleep better and felt better; also didn't get a headache if I missed a cup or so.
When I go shooting, I drink only a half cup or none, seems I take less time to get warmed up at the range! (My Parkinson's seems a little milder too...)