All true statements, but that's not what we're talking about. OP recognizes that he works 5-10 hours a week, and effectively blows the rest of the day off.
Reminds me a bit of an engineer who reported to me a few years ago. He would describe every week in our 1:1s and during team meetings how he was solving this tough thread-synchronization problem. Because we trusted each other, we trusted that the problem was difficult. Then when he finally submitted his code, it was a single line. A single trivial line (as in, read the python `multiprocessing` docs for 5 minutes and the solution is right there). OK... sometimes it can take a long time to find that one-line fix, I get it. But then I looked into his commit history, and it turns out he was averaging a few lines of code a week -- on a good week, and sometimes even zero. When I confronted him, he said "You can't measure my productivity by lines of code!!!" OK, sure, but how far am I supposed to excuse an engineer who has committed 100 lines of code in 10 months? What a statistical oddity, that every single task he took on turned out to be a single-line-fix dragon!