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Sky,refs,Journo`s,Celebs,even the fuckin prime minister,I mean he aint the Teflon Don for fucks sake.

And don't be cocking around with silly posts you juvenile bunch of twats. Right someone help me. The regulation states: "The Pro driver can only drive for a MAXIMUM of 55% of the race distance". There are only two drivers - one "pro" and one "amateur". We know the race time is 75 minutes. Assuming the race proceeds totally normally (let's say 1 lap = 1 minute = 1 mile), then Race Distance = 75 miles. If the "pro" can only race for 55% of the race, they can do no more than 41.25 miles and therefore a maximum of 41 laps. I think that's right. Now comes the complicated bit. The "pro" driver goes out first, but five of the "pro's" laps are spent under general caution, i.e. Safety Car. Let's say the Safety Car averages 2 minutes per lap. On what lap does the driver change have to take place now? The race distance has changed, see? But of course that's not really the question. The question is, how do we reach the right decision about when to call the "pro" driver in for the pit stop when we've had a Safety Car period? And really, here's what I want: A formula (or better still an Excel mathy addy-uppy thing) which would enable me to make the right decision live at the track? Is it even possible? We know the race is over 75 minutes. We know the race distance. We can make an fairly accurate guess at our average lap time (based on previous qualifying times) at race speed. We can time the safety car when it comes out and make a pretty good stab at its average lap time. We can see how many laps the Safety Car's been out for. The pit stop takes (let's say) 2 minutes 30 seconds: 15 seconds to reach the pit box, 60 seconds to refuel, 40 seconds driver change, 20 seconds additional pro/am penalty and 15 seconds to get back onto the track.