I can't remember if I already replied to this or not, but this is fun reading everyone's responses!
Everyone who said eyebrows takes the longest, I looked at your avatar pic and you girls have amazing eyebrows, so keep it up!
For me? I think I'm pretty quick with eyebrows and mascara- I see some people on youtube putting coat after coat on, I just use one coat and then comb through a bit to get the clumps out.
I can take maybe 5 minutes on my eyeshadow because I do very minimalistic looks- usually just 3 colors, all neutrals and ... well, light colors so they don't look very obvious or need much blending.
I guess the part that takes the longest for me is concealing my dark circles and any veins around my eyes, or any blemishes, without looking cakey or ... otherwise gross. So the concealing part is the longest for me. I work slowly and do a lot of blending and checking.
If I'm using a powder foundation, I can literally get it on my face in 1 minute or less. But if it's a liquid or a cream, it takes me longer, but I don't often wear those.