The way I’ve done it before is as follows. It seems a little long-winded at first, but tends to produce the best (consistent) results.
Create a repeater field: opening_hours. You make it so each ‘row’ has:
Then I make my own WordPress shortcode that loops through the repeater field to output the information in the format I want (HTML, relevant classes…etc.). This negates your requirement for loads of specifically named data (eg. hour_sunday).
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