I think it's pretty dark in Spain 10 pm, I've been in other countries equally far south (Greece etc), and it suddenly was dark 8-9 pm. That was in the middle of the summer.
Because of some mountains we don't see the midnight sun, but if those mountains was removed we would have sunshine at midnight. Even though we are in the shadow, it's full daylight nevertheless. It's both good and bad. Good when you wanna stay up late, bad when you wanna sleep.
In December we do not get full daylight ever, but it's fairly bright 9 am. And dark six hours later, 3 pm. It gets depressing sometimes.