It isn’t 8 hours of work and you’re done

That really depends on the type of content. Something like LTT is very much 8 hours and you're done, except the handful of times when there's a time crunch (e.g. new hardware launch). Even smaller creators plan out videos in advance and can create a working schedule.

The hardest part is starting out, followed by finding an audience. Once you get the audience, creating a consistent schedule is the easier part, especially once you can start hiring help.