What would you do if you had an extra hour in the day?

Exercise and drink a nutrition-balanced smoothie. Cos if you don't have your health, you don't have anything.

I used to enjoy an extra hours swim or a cycle in the cool of the morning in summer, when the countryside was at its best lit by the morning sun, before daylight savings was forced on us by city people who needed the government to tell them to get out of bed an hour early.

Probably read.

TBH, an hour would be eaten up by getting coffee, figuring out where I left off, getting back in the flow, etc. So I can't really see I'd get any extra 'project' (software, woodworking, etc) work done.