Is there a maximum word count when downloading articles as PDF or RTF documents?

The maximum word count, when downloading articles as PDF or RTF documents, is 180,000 words. You will receive a warning message that your download may fail if the word count exceeds this recommended limit. To ensure downloading please reduce the number of articles selected so the word count is below this limit. Note that a single article can be downloaded as either PDF or RTF, one at a time, if it exceeds the word count limitation. 

In the following image, the word count selected by a user was 840,839 which exceeded the maximum word count limitation: