Part-time?

I'm thinking of asking for 4 day a week, spend 1 day a week doing my own thing, or nothing, just have more time to think and do whatever I want. It's so acceptable to drop say 30k on a new car if you want and noone will question you, but if your particular desire happens to be 'free time' and you switch to part time everyone things you've gone mental. It's a crazy materialistic world we live in, but I'm thankful for it, because if everyone was like me there would be a lot more people relaxing, and a lot less goods being produced, perhaps leading to high prices. Or it might work the other way, if everyone was like me they might spend that relaxing time looking for new ideas and opportunities and trying things out, hacking things together, learning new things and perhaps, just perhaps some people smarter than me would be producing new and innovative things out of that free time leading to a wealthier society and cheaper goods and services for all.