That means your vacations aren't long enough. I tend to start getting the feeling of wanting to be productive about 2.5 weeks into any long vacation. Start with 3 weeks and then take off even more next time if it didn't work
A lot of people just don't want to work. Jobs suck. Heck, I like my job. It's a good job. it pays well, it's not stressful, I've automated the tedium,no get plenty of vacation time. Give me the option to not go back and id take it faster than you can blink.
I could vacation for 6 months and I would just appreciate the vacation, travel, and free time more and more. I still wouldn't want to go back to a job.
For Guilliman it's worse because he was in stasis. So for him it was merely moments between getting wounded by Fulgrim and waking up into a dystopian clusterfuck.
The guy in the picture slept for ten thousand years and woke up in a galaxy that would make Auschwitz look cute and cuddly. His job as regent is to un-fuck it. He's right to be upset about it.