What do you mean more than a day? Digital clocks don't drift like cheap analog clocks do. In one day they will be effectively exactly the same amount of sync'd that they were the day before.
Digital clocks drift just as much, and often even more. Anywhere from "few seconds per day" to "a whole minute per day" depending on how they're made. (For example, I think crystal oscillators aren't necessarily calibrated, and they're sensitive to temperature, and probably also to voltage if they're battery-powered? I don't know for sure.)
The oven clock is often synced to mains AC frequency, and the microwave might also be, in which case they wouldn't drift from each other – but everything else can drift away from them. (And even mains clocks can drift away from everything else if the grid frequency varies more than it should.)
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u/EvenConversation9730 6d ago
The fact their microwave and oven times match is what blows me away. I can never get those damn things to line up for more than a day