In short, you get 10 seconds of extra sprint time and your stamina replenishes 20 seconds faster.0.8 Sprint & Stamina
You can sprint continuously for 20 seconds
It takes 1min and 40 seconds to fully regenerate all of your stamina.
0.85 Sprint & Stamina
You can sprint continuously for 30 seconds
It takes 1min and 20 seconds to fully regenerate all of your stamina.
Note : The exception to this rule is the collaborator class, which has only 10 seconds of sprint.