Well, technically I spend an entire day on it. I don't get alot of time to actually do it so first I'll decide what pictures I'm going to use, then I'll get an idea in my head of what I want it to look like. Throughout the day I will gather the paper, maybe print what I need to print on the computer, later on I'll look through my embellishments. Then when my DS3 finally goes to bed I'll start cutting things out and deciding what works, pasting, cropping, etc. I'm still pretty new at this and I'm a serious perfectionist/control freak so that can take me up to 3 hours. I usually don't complete more than 1 page per day, 2 if it's a two page layout.
It would probably go faster if I could leave my supplies out.