Re: Can I save a AE loop and re-import it into AE?

Just render out that 1:06 worth, then when you Import, right click the footage in the Project Window and Interpret Footage>Main, then choose how many times you want it to loop (down near the bottom), twenty it sounds like, now the footage will loop twenty times and you won't need to render out the 20 second plus clip.

You could also put your little loop in a comp of it's own (or precomp them), then put that in the main comp and to that precomp ;layer, Layer>Enable Time Remapping, then add a loop expression to Time Remapping, (Copy the expression, Alt Click the Time Remapping Stopwatch, then Paste):

loopOut("cycle")

This will cause those 16 frames to loop endlessly, not rendering needed. It loops those two time remapping keyframes.

At some point you'll need to drag that right edge of the clip to the far right as when you apply time remapping, now you can extend the clip to the right.