Yup; an 8 hour work day is effectively 10 just with commuting included. In my case I've spent a long time commuting with the train, which would have given me like 20 minutes each way to work or do my own stuff - but for me that's too short, there's a big chance I would get too distracted and miss my stop, and I preferred just winding down for a bit during that time.

Then there's mandatory things like getting ready in the morning and dinner etc in the evening. That time is constricted even further if you have a family. If you're lucky you have 4 hours, if you're really lucky you still have energy during that time to work on stuff.