There are fixed expenses (shipping the equipment including the helicopter and transmitter aeroplane onto the location) and time-related expenses (the hours the transmitter aeroplane is airborne and the days the personnel must stay at the hotel). I don't think reducing one day makes much difference.
The smoke continues to be seen percolating around RB and Max leaving for Mercedes. It would be interesting to see Max and see if how he does.
But if Max does leave, does Red Bull become a...
Maybe if they're lucky, but I think it'll take a lot of work for them to catch the Racing Bulls without Max! :)
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