They'd honestly struggle to do 30 without a stop if you had more than 3 yellows. 30 isn't enough for a big time race and 40 is too much without a fuel stop.

For years people complained that Saturday was anti-climatic because Kinser or whomever won the race by half a lap etc...

The 50 laps has produced some really dynamite races the last few years including Schatz coming from 21st to win.