Jan, in order to answer your question I had to watch all three clips. Fascinating stuff, but no, he did not say how long it takes to make one arrow. The shafts stacked outside were left to cure for a year, though. The urushi lacquer painted on where the feathers are to go is left over night to dry.
the shafts are cut between October and December, then left to dry outside for about 5 months and before rainy season all the shaft must be dry. Then the shaft are divided by weight and number of junction. Shaft with 4 nodes are used to build mato-mae or enteki-mae arrows, light weight shaft with 3 nodes are used to build kuriya, the arrows for toshiya (long distance shooting). Havy weight shafts are use to build soya (war arrows) to preactice koshiya kumiyumi (like in video shown by Bruno)