I have CS5 projects with 60MB so you might have a little headroom
Thank you Klaus!
It's good to know I'm not in any danger yet at least
People have 700MB projects with lots of paint strokes, Rotobrush data or conventional keyframes, so you don't have anything to fear just yet. Generally this should not be a problem, it will just take forever to load and save such files. I'd consider the rest a moot point - AE's project format is not particularly robust and fail-safe, so when it happens, you're screwed either way no matter whether it's a small or a big file...
Thank you again!!
Well that's awesome to know, in that case I'll keep on going. I imagine the final will be about 75MB which is tiny in comparison. All my aep's to this point have been topping out around 5-10MB!