Yeah you could save them as an array inside a TEXT column in your business model just called 'opening_hours' or something.
You could go as far as having a HABTM relationship as I assume some businesses would have different opening hours but some might be the same so you could have relationships there.
For something so small that doesn't require any interaction from the user I would just go with saving them as an array.
You can then just loop through the array to print out the day and hours. Key/Value association.
It just would appear to be more code than necessary for opening hours. But I might be wrong and not understood the question.
Have a nice day