Richard,
I agree with Barry. I recently installed a PS3 Chain & Sound file to an upgrade kit on a project engine. It took just shy of 75 minutes. I have uploaded files to engines in the past that have taken much less time.
Not sure why but maybe somebody can explain why some uploads/downloads are faster than other and give a best case setup for uploading/downloading files to your engine.
A lot of patience and little luck is all that you need here.