Thursday – Optional Test/Tune
Friday – Practice, Qualifying Round 1, Qualifying Round 2 (best time from either session)
Saturday – Warmup, Qualifying Race
Sunday – Championship Races gridded by finishing position from Qualifying Race

Warmup and qualifying is usually 20 minutes or so if I remember correctly. Qualifying race is in the 25 minute range, the championship race is 45 minutes.

https://nasachampionships.com/event/