There is really more to it that "studying" in the way that you might mean it.
I spend at least some time each night thinking about the cases for the next day and refreshing the anatomy and operative technique, especially complex things that I haven't done in awhile like a particular free flap. You might not consider that studying but it sure takes time, and hopefully makes me better at what I do.
My answer is similar to Big's. I spend more time closer to the in service really studying. But we do COCLIA and the home study course so those things require reading and studying too. ENT is a lot more broad than people realize and requires a lot of outside work to master, you just can't see everything at any program so you have to brush up on the stuff that is rare/not seen.