I agree with Coach Jen - this is really only a concern if you are creating a very large calorie deficit on a routine basis. Take your hike as a nice bonus, and don't use it as an excuse to undo your hard work.
I disagree with Zorbs - 2500 does sound a little high, even at 284 lbs. A figure of around 150-200 calories per mile is typical when hiking (probably at the upper end for you), which would suggest around 1600 calories.
An alternative check is that it takes a very fit person working extremely hard to burn 800 calories per hour, and figures above this should be viewed with skepticism. And for something sustained for 3 hours would probably only be 600 calories per hour.
So probably a figure of 1500-2000 is more realistic (and that's still pretty darned impressive).
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0