I’m unsure

Rolling Schedule: Max. 255 mins interval?!

I'd like to use the Rolling Schedule to drip feed researched and added Tweets into my stream but not *that* frequently. 1-3 a day well spread out would be fine.

How can I do this?
Seems max. mins between tweets is 255mins...

In image, I change this to anything higher than 255 and though it says saved, when I check setting, it's back to 255mins.... frustrating!
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