Unfortunately the customer was not keen on dividing up the presentations into smaller subsections, so rendering out smaller files as part of a whole is out of the question.
I did find that saving my AE project as a Permiere Pro project I could string my comps into a timeline longer than 3 hours. The only issue with this is that the translation between the two programs is not flawless. I noticed that there are some random black spots in the timeline and work space times not matching up.