The longest zip you have ever seen! (Weetwood LS16)

I doubt anyone will want this, but I have just cut a yellow zip out of the cover for a mattress topper (long story). It’s currently been fixed as a circular zip, but can be made linear. It’s 680cm long! I guess you can cut it and shorten it to any length you want, just secure the end of the zip by sewing over it well? It’s a good quality zip.