OK, 10,000 a week. 1500 a day, say. 60 minutes to charge a battery. 1 charged battery every minute. Allow some sort of buffer quantity. Not beyond the bounds of possibility.
Note, the 10,000 fuelling stops per week at a conventional garage would be reduced by a rather large number - 75%? - batteries will not always be swapped, often they'll be charged at home overnight.
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