10-12 on a work day, have done for 20 years. When I'm off I end up having 3-4 during the course of the day but certainly feel more sluggish on those days.
I took a break for 4 months a few years back (to see if I could) and really struggled to keep my eyes open, even with 8 hours sleep on a normal day.
I don't have any issue sleeping and no negative effects from large volumes of coffee. I drink high strength coffee.
This is also probably offset because I drink a lot of water during my day as well. Again probably 10+ pints of water during the course of the day. I'll drink water no matter what I'm doing. I can't fathom how some people go hours without water, to me it's the most important thing for my brain function.
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10-12 on a work day, have done for 20 years. When I'm off I end up having 3-4 during the course of the day but certainly feel more sluggish on those days.
I took a break for 4 months a few years back (to see if I could) and really struggled to keep my eyes open, even with 8 hours sleep on a normal day.
I don't have any issue sleeping and no negative effects from large volumes of coffee. I drink high strength coffee.
This is also probably offset because I drink a lot of water during my day as well. Again probably 10+ pints of water during the course of the day. I'll drink water no matter what I'm doing. I can't fathom how some people go hours without water, to me it's the most important thing for my brain function.