Here's What Determines How Long the Total Eclipse Will Last in Your Location
Briefly

...Radar Base will experience four minutes and 27 seconds of totality during the eclipse that will cross the mainland U.S. that day.
...a function of the Earth's orbit around the sun, the moon's orbit around the Earth and where exactly you're standing on the sphere of our world when the phenomenon is playing out.
A moon at or approaching apogee appears too small to block the sun completely, creating... an annular eclipse...
Read at time.com
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