I guess driver stints would be the safe running time of your lipo before it cuts off, also any more than 20 mins and we would have fried esc and melted motors. Tyre changes and maintenance would be done within your downtime between stints.
If you have teams that are running the same chassis then you could have a common shell that gets transferred with a transponder attatched (although they probably won't last 6 hours without charging)
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