Hey guys I was practicing today and was running 4:16/4:17s in my M5. I was able to squeeze 6 laps before my tires were shot. That last lap was pretty hairy though! The bumpy nature of the track likes to unsettle the car and make it slide a LOT. Dj if you're still undecided on laps it looks like 11 should stick you in that 45-50 minute range. Oh and if nobody minds me asking how is everyone getting 550pp? Getting rid of weight or adding power? I went the weight route and stripped my BMW of all the weight I could.
Since I'm already babbling I found some a useful thread on here about time progression (would post link but I'm on an iPhone). If you set it at 1, one real second equals a second in game, set it at 60 and 1 real second equals 60 in game seconds. Basically if we want a 50/50 day/night split (I think thats what someone said they were going for) we should start and end at the same time. So I figure if we average 256 seconds/lap (4:16) and we do 11 laps, that will be 2816 real seconds. We want to cover 86,400 in game seconds (one full day) so 86,400/2816 equals 30.681, so ideally a time progression of 31 would be appropriate. Sorry if you already had it figured out, just thought I'd share!