In previous years I've had more time and would scrap at all kinds of times. This year, many weekdays I've been at work, so I could only scrap in the evening. But I've managed to make every page so far on the day it was assigned. On days I don't have to go out work, I prefer to scrap first thing in the morning.
Most MOC challenges don't take me any longer than any other scrapbook page. It varies widely, depending on what I have to do. For example, for Year In Review, I think I spent over an hour, maybe 2, just choosing my photos. (I love reminiscing though!) Today's layout may have taken a bit longer than average, searching for stitches and flat stuff in my stash that are still available in the store. I'd estimate most of my layouts take an hour or a little more. Rarely do I spend much less than an hour. And I think the longest is probably around four hours. I tend to prefer doing them all in one sitting, but I don't have to. After I picked out my stitching for today's Stitched Down Stuff, I went out for my walk before coming back in and finishing the page a couple hours later.
I think the things that help my efficiency are . . .
1. I'm doing this just for fun and I'm easygoing, so I make choices quickly and don't agonize over making things just so.
2. My TLP stash is all in one folder, I use the Search function a lot, and when Current Product is important I sort my stash with Newest Added first and only select from that stuff. To make it easier to credit in the gallery, as I'm selecting items from my stash, I open that kit in the store in another tab in my browser. (Sometimes I have many tabs open when I'm ready to post my page!)
3. I read the challenge first thing in the morning, always. Then I have at least a little while (sometimes all day) to think about it before I scrap. Then I reread the directions again. And again when I think I'm done!