50 minutes (single continuous period — no halftime); No substitutions: players who exit (injury, ejection) are not replaced; Reduced-team play continues if one side has fewer players
Why people argue about this
People often assume that substitutions are allowed in some form during Calcio Storico Fiorentino matches simply because it's a continuous play format, but actually, they misunderstand the spirit of the game where no substitutions are permitted to maintain the historical integrity and physical challenge inherent in this ancient sport.