Quite often, for marketing research, you may need someone to digest a huge amount of information and then come up with a short summary or a detailed report.
A typical example will be finding competitors by crawling on the web and then making notes about their USPs and other peculiarities.
During my Ph.D., I used to read a few dozens of scientific manuscripts per day. In addition to that, I conducted a content analysis for my thesis completely by myself. It included reading and coding a few hundred pages.
In the course of time, I have developed my own routines for this. I can quickly consume information, take it apart, and then assemble the main points and themes together. With information I mean pretty much everything: blogs, newspapers, professional journals, social media, discussion forums, white papers, statistical reports, etc. etc.
I also use a few Python programming packages to perform web scraping and data extraction to collect data automatically.