On and off, I've been working multiple remote full-time jobs, both as a contract and "hired" employee, for several years.
I saw some TikTok where the guy said he takes two-hour lunches and does his eight hours of work in 30 minutes. This makes me feel as though this is more common than I thought.
You need to be really good at time management and have to be able to bullshit to get out of conflicting meetings. One of the reasons I'm a bit scared to do it is the meetings.