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Notifications Received in 30 Minutes of Class — LessWrong
(www.lesswrong.com)
This is a most excellent place for technology news and articles.
This is what notification profiles were built for. Set it to work/school/whatever and select who you want to get through and notifications are delivered, all else are silenced.
I even have one called “Blackout”. Nothing gets through, no one is approved, everything is silenced—for when I absolutely must not be disturbed.