History graph card show less than 1 hour

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In the History Graph card, you can choose “Hours to show”.You can’t enter a (decimal) number less than 1 in the field. Is there a way to have the card show (for example) 30min? Or 10s?

EDIT: As usual, right after posting, I figured out you CAN enter a decimal value less than 1.
The field becomes red, as if it’s an unsupported entry. But you can still save it and it works.
Is there a reason why the field turns red with a value less than 1?

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Thanks. That is exactly it.
There is a warning and the field turns red. But the functionality is there. It works fine when you just click ‘save’.