If you did
not use the glow plugs that [video] seems very normal to me. Exactly what my
BX2200 would do. But if that little yellow coil symbol upper left means your glow plugs are on for that period of time -- then there is something not quite right.
If that little yellow coil symbol, upper left, means your glow plugs are SUPPOSED to be running for that example period of time in the video then I'm betting there is something ailing & the glow plugs are not really "on." Either way, I'm saying if the glow plugs are really on it should start faster than that.
My MF2660 with a larger 4cyl Perkins starts much faster than that in warm weather without glow plugs but 4 Kubotas I have DO NOT.
I my opinion you use the glow plugs for every "first start" regardless of outdoor air temperature. A very short glow plug time in warm weather and longer in cold weather. Inversely proportional to the temp. I think most people gain experience and a feel for what seems optimum for them. Try just a few seconds of glow plug time and then crank. Play with the amount of time until you are happy with how quick it starts. None of this is critical or to make a big deal of but you are wearing out a lot more things cranking that engine than you are letting glow plugs run a few seconds ... over the life of the machine.