How many apps is a reasonable number to maintain?

As a solo SCCM dev, trying to keep up with not only creating, but maintaining patches and version changes on several dozen large apps used on 1000-2000 devices has been overwhelming. That's before starting to address the hundreds of smaller, lesser-used apps required around the company.

I am wondering roughly how many disparate SCCM apps a dev should be expected to maintain continually, and/or how big a SCCM app dev team should be at a mid-size company? Do you split up work by app, or by random assignments as needed?