That is what I had in mind with 15 minutes interval. I guess I will have to either write a plugin my self or stick with the 2 single select fields solution.
I have not met a plugin that embeds such field. You can consider creation of your own addon that provides the field.
Easy way is to add 2 Single Select custom fields. 1st with days: Mon, Tue, ... and 2nd with hours intervals: 12:00 AM, 12:30 AM, ...
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