I'd wager the average person can walk a mile in an hour. So, presuming an 8 hour rest, that's 16 hours of walk-time. So, 16 miles.
A party, due to the nature of a group, would probably go slower, so maybe 12 miles(round down to multiples of 5 for easy math).
Depending on the harshness of terrain, even less. The more extreme, the shorter the distance they can travel.
You guys are frikken joking, are WAAAAAY out of shape!!!
In the woods, with undergrowth, it MIGHT be one mile an hour, MORE likely 2 miles an hour.
If it's relatively clear...or on a trail it's 4 miles an hour...3 miles if I'm with slowpokes.
PPS: From the responses I take it that NONE of the responders are actually backpackers? If I had a group that went that slow and weren't a bunch of kids...I'd never go on another backpacking trip with them...maybe a slow camping trip but not a serious hike...we'd never finish the hikes! Much less the mountain climbing...we'd be lucky to get to the far off mount before we'd have to turn back because we ran out of time!
Sure. I've done 24 miles in a day, in the Rockies, with a full backpack. But if I was carrying armor, weapons, and camping supplies that weren't made out of ultra light materials? No way.
Let alone healing up from that arrow the orc put in me last week.