I had an Scm saw and put that together from new.
Yes it took me about a day to build and set it up, so slightly longer that your guy.
But it was not difficult, just time consuming.
If you do it yourself, you then know it is right and more importantly how to correct it if for some reason it needs adjusting.
I have just spent the last few weeks setting up a workshop for a local joiner, this was a lot more difficult as he bought second hand stuff which needed a lot of adjustment to get things to run right.
I had to think back 30 plus years to when I did my wood machinists course for some of the settings.
I have had an engineer come out to a machine though when I did not have the time to rebuild gear boxes on a SCM four sider when an employee distroyed them.