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I would guess 25 cups translates to an excessive amount anywhere in the world.

There isn't a ANSI/ISO standard to my knowledge. But some ramblings that might help you ballpark it:

One shot of espresso equates to roughly 100mg of caffeine - give or take (a lot).

>How many GreatBrittan cups

Assuming you're British...if you walk Costa and ask for a small black...you're getting around 2 cups worth of caffeine. Just under 200mg. They're not likely to serve you anything north of 400mg.

Tolerances for caffeine are all over the place. I know that personally at around 1000mg per day things go for focused/wired to uncomfortable for me.

25 cups...is at least double that.

'cup' typically refers to a demitasse in colloquial coffeespeak, but this is a scientific study, so ymmv. should be roundabouts 100mlish for demitasse and 200ml for US cup, give or take

I assume they're talking about my 1.5 litre / 52 oz cups.