That first 'proper' drink after a 'dry' spell always hits harder, doesn't it? Not that hard, though. Eight times the Spanish limit is only about 4 times the more familiar UK limit, which is usually just a hangover, so there must be more to it.
What, however, is a typical Fuerteventura measure?
The only way I've seen it counted is to 'float the ice'. I'm guessing about 50-60ml, compared to 25ml in UK.
Gin is typically about 20% stronger, too (47% against 40%). I don't know about other spirits.
That means one glass can be two and a half to three times the size of our single.
Easy mistake.