I imported composition from PSD to AE with retain layer sizes. the composition was set to be 7 sec. all layers from PSD were timed as 2 frames layers for some reason. the max i can time sterch it is to 5 sec.
But that's not the only problem.
i use time remaping and what it does is that it reduces the layers size
Start by checking the "Still duration" in teh import settings in the preferences. Otherwise I think the answer is pretty much in your post - AE doesn't care for PSD animation and whatever you do in Photoshop doesn't really matter in that department. Convert your stuff to normal layers and remove any animation in PS.