How long should a successful rebuild take?

The Commanders got a dynamic QB and are competing. The Broncos got an intelligent, experienced, rookie QB to go along with their difference making Head Coach and they're winning with the least amount of talent in the race. The Texans got a dynamic QB and a dynamic coach, and they've turned it around and competed in two straight seasons.
Stroud is not as good as he was last yr. They are 9-5 because the AFCS is just as bad if not worse than the NFCS. They beat the Bills early in the season but that's it