My answer would be "it depends".... on mood, where I'm going, how much time I've got, how good/bad my skin condition is at the time....
I tend to practice things that I'm planning to wear "out" on free evenings to amuse myself, just for fun, I find it relaxing and it's good practice. Then when it's time to slap it on and wear it out I can do it quite quick...
On average about 5-15 mins though for simple day stuff, and about ten minutes more than that to glam it up for evening wear.