Great question — answering as the UphillTech team:
I'm going to guess from the mention of half at least twice in the question that you rigidly follow one of those "The only one true way to sourdough" methods that involves doubling, using half, throwing away half, etc. I can report from actual experience that you can feed a volume of starter amounts inclusive from 10% of its volume to 400% of it's volume without any detrimental effect. Now, obviously 10% is more of a "tiding the starter over" feeding while 400% is serious bulking up and reduces the sourness if used soon, but it all works to make bread. Thus, if you gave it "two feedings" separated by no hours at all, it would be fine. It's also fine to separate them by a few hours or 12-24...
Full answer by Ecnerwal: https://cooking.stackexchange.com/a/130551 (CC BY-SA 4.0).
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