No rule per se, but usually more typical days/times, at least when it comes to regular (non-emergency or delayed) releases. Mon - Thu are all days that are usually in play -- some of them perhaps being used more often at times in comparison to others -- with 10 AM or 1 PM (Pacific) being the potential release timeframes.There‘s no rule on when Apple releases a build. We‘ve been through all days from Mo-Fr over the years of beta testing.
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