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Tesla fast charging at Superchargers is closer to 15-30 minutes, depending on several factors (temperature, battery pack size, state of charge, etc). I have had some 45-60 minute outliers on rare occasions, but it isn’t the norm (over my ~30k miles of road tripping).

If the optimal overall speed is determined by greatest efficiency, which means a reasonable maximum speed, then I would think traffic would have an even bigger impact: it's not profitable to compensate for heavy traffic with absurd speeds in rural highways, so the overall speed is really just determined by (1) amount of traffic, (2) battery size, (3) charge time, and (4) aerodynamics.

In this case I'd expect traffic is really the dominant factor.

need a big truck to draft behind for max efficiency :)

It also means you aren't waiting for superchargers, and also it's generally faster to charge if the charging station is empty.