I'm warped up now. It took a whole afternoon and some of the evening, and I've only used a part of the width of this slim loom (96 ends) and four of the eight shafts.
I can't imagine getting to grips with this if I wasn't already familiar with warping up my knitters loom, and it's difficult to imagine how long it would take to fill the width of one of the wider looms.
The few passes of chunky yarn is a heading - to spread the threads out evenly after the knots. This is also useful to test whether the warp ends are all threaded properly (they weren't) and give you a chance to sort any problems out before you go any further (I did).