The FIA Formula 2 Championship is the premier junior single-seater series, with races taking place as part of Formula 1 events. The modern F2 began as the GP2 Series in 2005 before taking on its current name in 2017.
F1 will have a record-length schedule in 2024, in terms of races and calendar duration, and it prompted concerns of staff burnout. That’s an issue in junior series too.