I make these all the time. They take maybe...15 minutes for a bracelet. An hour for a lanyard. It's easy-peezy japaneezy.
The guy that sells those on his site does the Double-Up method. You basically do what Instructables says to do, but do two at a time on the same buckle and weave them together. It's a bit harder, but you can actually pack about 20 feet into a bracelet that's 6-7", but it looks ABSURDLY huge on your wrist.
King Cobra it's called, and you don't really do two at once, just weave the bracelet, the go back over it with the remaining cord. doubles the needed length of cord.
i make fobs with the king cobra stitch and put one on anything i can that i carry regularly.
i also made a 3D maglight holder