WhatsApp will soon allow you delete messages even after an hour
By: Team Ifairer | Posted: 04-03-2018
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Another popular workaround that lets you access deleted WhatsApp messages even after seven minutes involves disabling mobile internet and Wi-Fi on your phone. Next, choose Settings > choose Apps > WhatsApp and hit Force Stop. You can read about how to delete WhatsApp messages for everyone even after 7 minutes here.
source: hindustantimes.com