Cutting back to single digits is the hardest part!
My company had a row of 3 automated espresso machines so I timed the dispensing delay (which happened to be almost exactly the grind time) so that I could pipeline the process using all of them. People were moderately horrified as I filled my coffee cup with a hexa-shot of espresso... but why waste time hanging around the water cooler when you can vibrate in front of your computer?
It's actually not exactly that inconceivable if the you're using the traditional 5 fl oz cup size for tea/coffee.
I've just finished my morning coffee - a 34fl oz French press's worth, black. That's almost 7 "cups" by traditional measure, but it's not a particularly outlandish amount.
Then I read the OP... and yes, it turns out there are people who routinely drink that much coffee in the UK.
Wow.
Can you imagine what one's body would feel like after ingesting 25 -- twenty five -- cups of coffee in a 24-hour period?[a]
[a] Assumes zero hours of sleep per day.