- 15 minutes would be gathering the necessary tools and gathering at the workbench. - Some other 10 would be measuring and thinking how to do it - Then 15 min

- 15 minutes would be gathering the necessary tools and gathering at the workbench. - Some other 10 would be measuring and thinking how to do it - Then 15 minutes would be measuring, drawing, cutting and drilling. Oh, and I forgot I would need this tool, let's get it downstairs/from garage/house... - Finding out it doesn't fit perfectly you already lost 5 mins. And now if hole is too big, you create new one, +15 mins. If hole is is too small, you search for your sandpaper. Sand it + fit, sand it + fit... - Ahh, it broke, because wood was too thin. Retry. - Putting tools back, cleaning up your place +10 min Total: Little more than hour realistically :) /from a perspective of DIYer, how it usually happens with me.