[ScrollTrigger - Duration]

Oh very nice! Yes, that's what I meant.  Thank you! I'll play around with this option.

[ScrollTrigger - Duration]

I am looking for something that will allow me to drag out an animation for how long it takes the user to scroll through the element.  So, for example, a div that takes up 100% height of browser window.  It's at 0% opacity.  As soon as it enter's users scroll window, it starts to animate to 100%, but it doesn't get to 100% until it's out of the users scroll window again on the other side.  I am only seeing duration as an amount of time.  Is this a possibility?