Identify high of first 70 minute candle

Hey everyone i hope you guys are doing absolutely fine. now i wanna ask you that how can i find the highest high of first 70 mnt candle.
i've tried this..

H11 = HIGHESTSince( Day() != Ref( Day(), -1 ), H );

You can probably just wrap all of that in ValueWhen() to get what you want.

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