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Satellites move at about the speed a plane moves across the sky, but you can perceive a subtle difference in the path, it's more curved and less of a chord that planes take.
They will cross about .5 to .66 of the sky before passing into the Earth's shadow in a minute or two.
See here for track details: Heavens Above
Backstop
Fast moving, relative to background, small dot of light fainter than the background stars?