We will have regularly scheduled breaks throughout the conference. But you don't have to wait for a break to have a little snack to keep you going!
If you can create more than one spot (a standing spot, a sitting spot) it will help your focus to be able to switch between more than one "office."
Consider hooking your computer up to an external speaker to better hear presenters and participants. It can also help with the feedback/echo issue that can happen. It's not necessary, but if you have one around...try it out!