Most owners I meet have tried the forty-page manual. It took a month of weekends, went into a shared drive, and nobody has opened it since.
The writing was rarely the problem. A manual is built to be read front to back, and nobody reads a manual front to back. People look something up at the moment they're stuck, standing on site with the next job waiting. If finding the page takes longer than asking you, they'll ask you.
The procedures that survive have four things in common. They're short, one task to a page. Someone owns each one. Each has a date when it gets checked. And it sits where the work happens, linked from the job card or the office checklist, so it's in front of people at the moment they'd otherwise ring you.
Miss any of those and the page drifts out of date. Once the team stops trusting it, the questions come back to you. So what we build is the keeping as much as the writing.