"Right." agrees Michael.
"I have twenty days of food for one, climbing and hauling gear, some mundane healing supplies, a few spell components, a little pioneering gear, camping equipment..."
He shrugs.
"Let's take a serious look at this map and see if a month is a fair assessment of travel time. I have backup plans for food, water, and shelter, but they might not work for this many people."
He bends his head back to the map, curious about the distance they need to travel, the time it will take, roads and settlements (a pipe dream, he knows) and if they need cold or hot weather gear.
If the map is obliging enough to state "Here be large monsters" he notes that too, though he's not sure whether they should be avoided or sought after.
A really big nasty monster, of course, might well have crawled out of a shaft leading to the Underdark, providing them with a quick route down.
It might also, of course, eat them all.