The entire interview process took roughly a month and a half with a very ambiguous timeline. The process involved a two hour long research exercise. I made it to the 6th (and I think final) round of interviews but did not get the position.

I completely agree with everything said by the other comments about their interview process. I did a combined 12 hours of completely free labour for them in research assignments, writing assignments etc. I did not receive an offer and had to follow up multiple times. My emails were ignored for weeks on end. I have never experienced such an arduous interview process only to be told they "decided not to hire." Do not recommend.