10 meters should work. I started with 25 feet of 16awg Neotech stranded teflon and needed a bit more for my Markwarts in 620 cabs. I could have been more conservative with it, but there was some trial and error involved. In the end I used ~4m to connect the crossover to the driver in each speaker (1m for each lead), ~1ft on the crossover itself, then maybe 2ft to connect it to the internal binding posts. So, estimated ~10m total.
If I ever rebuild them I’ll try the Duelund. It might be easier to work with. I tried the dual jacketed 16awg as speaker cables and if I was committed to it I’d probably skip the binding posts and go directly from amp to crossover.
Looking forward to seeing your results!