Adjusting the speed of an animation?

Even under best conditions, a 60 day video would render for several days to create it if you assume multiple times the speed of the realtime playback. And it's not even possible to create sich a clip, let alone handle the quadrizillion frames and the data of the files. That would be bigger than even a movie production. And for what? A stonkin' 600 px progress bar that wouldn't even move by a single full pixel every hour? What would any of that be good for? At best you would produce an image sequence where the image updates every hour or even less by means of a JavaScript in the browser or an entirely native solution based on web techniques, but clearly, none of that exactly requires AE. I think you're really looking on the completely wrong end.

Mylenium

Can you explain a little more about what you're needing?  The simplest way to do a progress bar is to animate a shape layer moving from left to right and use another, non-animated shape as it's alpha track matte.  

But you've tagged this as an expression question and mentioned days, so maybe if you sketch out some storyboards and post here, we might be able to get a better idea what you're after.