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Let's do a back-of-the-envelope calculation, carrying only one digit with whatever input data we can find. The satellites are about 200kg, and various commentators suggest the thrusters can provide about 100mN thrust or so. That's an acceleration of $0.5\times 10^{-3}$ m/s/s, or about 2m/s per hour. Even a small acceleration builds up quadratically, and ...