No idea if this is a viable workaround for you Bruce, but I’ve got a free fixed rate crawl filter that suffers from the same text limit as does the usual filter, however, as the crawl rate is fixed you can use it to align multiple sections of text throughout the 2 hour show that all crawl “as one” so it may at least offer some respite from the 4 day render option.
https://web.me .com/andymees
Similarly you might just use Alex’s filter and try breaking your 2 hours of text into 6 x 20 minute crawls or 12 x 10 minute crawls etc and see if the processing load for the renders are somewhat alleviated that way