I'm the Canvas Admin in a district of 42 schools with around 33,000 students, to give an idea of the size. I oversee the entire system, but have a programmer that I can reach out to for the SIS Import. This year, there hasn't been as much for him to do, and I've only reached out to him for special workaround requests and issues with our import. Maybe 2 or 3 times since August.
There are some users that have admin roles, but for the most part the role is limited to seeing the courses of other teachers at their site. It's really just to help with small or common issues like unpublished pages or incorrect links. While they probably could do more than help with user errors, they are often part of our tech support system and have other roles to fulfill. Also, when there is a real issue I tend to find out faster.
I can be incredibly busy at times, especially at the start of school, and not so much at other times. Fortunately, the busy times tend to be obvious, like the start of school or end of the term. Although, when I'm not busy there is always something to do like prep for next year, research, test things, look at the Canvas community to see what other people are doing, create documentation specific to our instance, etc.
In addition to help desk tickets with immediate issues/questions I work on communication to prepare for busy times (course setup or reminders), to introduce new features (there is new stuff all the time!) or address any questions that are coming up in the help desk a lot. Also since I have my "finger on the pulse" through help desk tickets, I make recommendations for district best practices and training topics.
Hope this helps!
