Same experience as everyone else, 5-10 seconds of the glow plug and it starts right off.
I will note that Kubota does recommend extended warmup (at idle) before using it in cold weather (20 minutes at zero F IIRC). I mentioned that to the dealer and he just laughed and said "nobody does that". However, if it is very cold (10F) I do give it a little warmup time and take it easy for the first few minutes.
Also, Kubota's SuperUDT transmission fluid seems to be much better in cold weather.
Ken