Calculate with collection field TIME and timepicker

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I couldn’t understand what exactly you wish to achieve (maybe try to add clearer explanation),
Anyway 2 comments:
To get the hours and minutes you can use:

let timeSplitter = timeValue.split(":");
let hours = Number(timeSplitter[0]);
let minuets = Number(timeSplitter[1]);

Also you don’t need an async function and await here, as Number() is not a promise.