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@tokyo_0 It seems as per Vaishnav followers, if it's any less than 96 minutes between the end of the Dashami tithi(moon phase) and the day's sunrise, the day isn't to be counted as an Ekadashi and so the Vrat is carried onto the next day.
Apparently regular worshippers(Grihastas) can worship without worrying about such rules. This results in 2 Ekadashis.
I've also heard of people fasting for 2 days and observing a Jagaran during the night in between for such cases.