Apparently my employer feels that 1 is too many...I am responsible for doc control, daily QA activities (I supervise the department, we have no QA manager), customer and supplier communication, corrective actions, daily ISO "stuff" and internal audits, reports (monthly, although there is always someone with a special request), and I forget what else.
Recently I explained to the big boss (again) that this is way too much for one person. I am now the ISO geek - MR, doc control, and related activities. The QE we hired last spring is now taking over my other responsibilities. Life is much better!