I used around 36 feet of 2.4mm cord to make this cobra stitch/Solomon bar/Portuguese sinnet/square knotting(may be a couple more names for it out there...) neck lanyard, with a break-away hidden under a 5 lead 4 bight Turk's head knot. The Turk's head is snug enough to stay in place, yet not interfere with the safety function.
Some folks need the break-away on a lanyard for peace of mind, and it may even be a requirement if they wear one at work. A safety feature for a neck lanyard is definitely a must for kids, since 'safety' is an unknown or yet to be learned concept for children.
I started with 2, two foot long pieces, of the 2.4mm braided nylon cord, attached to both parts of the break-away(just overhand stopper knots securing them).
Then I had two 20 foot long pieces of cord(middled, one for each side) for making the knots over the single strands on the break-away.
Once I had the length of those long knotted sections where I wanted them, I have a total of six strands where they all come together. Two long outer strands, two long inner strands, and the two short core strands.
I take the two long inner strands and looped them around the split ring, at the length I want for the end section, and make the knots back towards the point where the long sections come together, keeping the two short core strands in the center of these knots for the core.
I then trim/melt the remaining long inner strands and the short strands to get them out of the way.
I now have just the two long outer strands left, to make the king cobra section of knots over the shorter finished section, then trim/melt.
Finally, I used a few more feet(4 or 5 feet I think) of cord to make the turks head(5L4B) over a Sharpie marker, work out the slack and tighten it up, then it's slid over the break-away.
Hope that's not too complicated to visualize. :)