MO Cap extension

Hi there. I am new to blender and seem to be getting on fine for now. I have a question though.
I am using some MO cap files on a rig that I made. (armiture-to make human).

rig and mo cap is working fine but my run cycle is to short. (30sec)
Is there a way to copy paste keyframes and move them to a position to the run cycle would continue? I have done
something similar in after FX.

I know the mo cap its not a defined loop so I see I might be poblems ‘joining’
Does anyone know where I could foind a loop run in place mocap file?
I really want to avoid animating as I dont have the time.

Thanks very much for any help or pointers.
Shane