>>536953817
?????
You can see very clearly when you recover from it, your char stops reeling back and does a returning to neutral animation.
It has a fixed duration now too, so it's even easier to tell as long as you are looking at the screen, you got like 3s to react to the fact that you got hit by a stagger.
It shouldn't really matter how long you're in disadvantage for, you're negative so you shouldn't be mashing after anyway.