That seems a bit high.
It's running time was 102 minutes, or 6120 seconds.
IDK what the framerate but 60 seems like a decent guess, as it's the refresh rate of most monitors and max fps of games that limit fps.
That's 367,200 frames.
That's 55,080,000 hours.
Or 6287 years.
Even if they had 6287 computers running simultaneously that'd still take a whole year to render.
they probably have larger render farms than that, im guessing they have about 10000 cores but that's just an estimate.
also many of the scenes vary in complexity so render times could change, judging by how quickly the movie was made, that statistic is probably token from the most complex scene to render in the movie
movies are usually 24 frames per second
take a look by clicking on the pics:


both of them are really quite amazing graphics wise, while lego movie imitates what it would actually look like if filmed better, in the end i'd say more time was put into frozen