Does this make actual sense?

[ChaosTrulyReigns]

There's a sign outside a local Toby Carvery advertising their new breakfast service.

"Sun - Sat, 8am - 10am"

I think it probably does make sense, but surely it is more efficient and user-friendly to say "Everyday"?

or something similar?

Every day, surely.
Sorry, but this is pedants' corner .

This is going to open the whole week starting on a Sunday/Monday can of worms, you know...

Are you sure they don't only do breakfasts at the weekend and are confused re which way round Saturday and Sunday occur?

That puzzlled me too Puss.