loverofgeography on Instagram posted an interesting albeit sourceless infographic last month:

While I couldn’t verify this information, it makes basic sense. 6:30-7:30pm in the UK sounds fair for dinner time as do later times of 9:00-10:00pm for Spain and Portugal. Scandanavia had the earlist dinner time ranges of 4:00-6:00pm.
What time do you eat your dinner?