I think these could be the update times, but not entirely sure. Came from IRS’s Where’s my Refund: Refund Help:
Where’s My Refund? is available almost all of the time. However, our system is not available every Monday from 12:00 am (Midnight) to 3:00 am Eastern Time.
Our Change of Address and Refund Trace features are not available during the following times (Eastern Time):
Sunday 12:00 am (Midnight) to 7:00 pm
Monday 12:00 am (Midnight) to 6:00 am
Tuesday 3:30 am to 6:00 am
Wednesday 3:30 am to 6:00 am
Thursday 3:30 am to 6:00 am
Friday 3:30 am to 6:00 am
Saturday 3:30 am to 6:00 am and 9:00 pm to 12:00 am (Midnight)
These could be the times when they update everything.
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