I don't remember exactly, it's been 5 years, but I remember there were almost 4000 loops. The loom is a little less than a meter across, but most loop don't span the entire width of the loom, so half a meter per loop is a good estimate, which would yield 2 kilometers. I think that's only 20 euros worth of thread.

Similarly, assuming the average loop took me 10 seconds to do, that amounts to about 10 hours, and I do remember that the final step only took a day or 4, with a few hours of work every evening.