He does it ALL DAY EVERY DAY THOUGH
Not as often as you think actually. I use to post everyday back when I started but over the last year I have slowed down considerably. Pretty much don't post on the weekends at all anymore and usually take a couple days off during the week. If you look at what I posted today, total it probably took a half hour or so to find the content, convert to gifs, and then post it. Once you've done it for a while and know what to look for posting takes a lot less time than you would think.