Does Dash Juice last the entire mission?

[Flatulence Florence]

Or does the buff go away after a set time?

[Juno Brier]

Pretty sure it goes away after a while. I don't use them much since I don't use Bow.

[Arthur.C]

No, it wears off.

[awanderingswordsman]

Lasts like 5 minutes.

[Goilveig]

The mushroomancer version lasts until you cart I believe.

Edit: I was wrong, it lasts only as long as dash juice does.

[Dertin]

next time you could just try it out?

[Revonlieke]

Also it has a cap on how much you can reduce the stamina consumption.
Having lvl 3 on Constitution + Drinking a Dash Juice caps at 50% reduction on stamina consuption (actually 55%! 30% from lvl3 constitution and 25% from Dash juice)

So you wont benefit at all for having higher level constitution skill if you drink dash juice as well since you are already at the cap.