It takes just one perfect day to do the whole thing.. ie about 26 degrees and no wind.
BUt yeah in my case.. took me days from when I started as I had to counter wind/ rain and crappy summer weather. Not lucky enough to have a spray room or ideal conditions.
another tip. Dont spray too close to the object... the directions on the can are 100% correct for an even coat you do need to be about 20-25cm away from object. Lots of lighter coats works much better than thicker uneven coats.
Also, do use a mask for your face and goggles/glasses for your eyes. a lot of fine particles you do not want in your lungs or eyes.