Here's a quick glance of my PLR file:
QUICK TimeScaledWeather="1" // Whether weather time is scaled with session length
MULTI TimeScaledWeather="1"
Practice1StartingTime="-1" // -3=random, -2=random daytime, -1=default RFM, 0-1439=minutes after midnight
QualifyingStartingTime="-1" // -3=random, -2=random daytime, -1=default RFM, 0-1439=minutes after midnight
WarmupStartingTime="-1" // -3=random, -2=random daytime, -1=default RFM, 0-1439=minutes after midnight
QUICK RaceStartingTime="-1" // -3=random, -2=random daytime, -1=default RFM, 0-1439=minutes after midnight to start race
MULTI RaceStartingTime="-1"
QUICK RaceTimeScale="2" // -1 = use race distance percentage, 0 - 60 = multiply time by given factor
MULTI RaceTimeScale="-1"
QUICK PrivateQualifying="2" // 0=all cars qualify visibly on track together, 1=only one car is visible at a time, 2=use default from RFM, season, or track entry PrivateQualifying=<0 or 1>
Doing quick races of only 2 laps, I had to change the QUICK RaceTimeScale from default (-1) to 2, otherwise, after the first lap it gets really dark and I can't keep racing. Other options are at default.