Alice and Bob are lost in the wilderness with no supplies!
Luckily, they're trained for this kind of thing; they decide to forage
and hunt for food.
Phew, what a relief!
About how many hours per day will they be spending on simply acquiring
calories? (I assume that the type of ecosystem around them is a strong
variable in this answer.)
So we know the following:
- Assume a modern era, and access to the guns and ammunition.
- They have training. I will assume their training is general outdoorsmanship, maybe they were boy/girl scouts.
- They remember their plant identification (food/not food, poison/not poison)
- Fire building skills
- Animal cleaning/gutting
With all this in mind the final variable is location. Location will have a gigantic impact on survivability so here goes.
- Desert. The guns help a lot less here because there is a lot less game and no fuel for fires. In reality the only way they survive being stranded in a desert is to escape the desert. They type of desert matters too...a sea of sand dunes is very different than say the Sonoran desert in the US southwest. Very high probability that they die in this scenario
- Arctic. They die. Like the desert, the only winning move is to escape.
- Forests and Plains. In this case they should do pretty well. Game should generally be abundant, there are plenty of plants to eat, and fuel can be found in most cases. Winters will be rough if they are out for an extended period of time...so they could still die.
- Mountains. Mountains vary a lot as far as what resources are available...the mountains outside Las Vegas are barren rock... (meaning they die) the Appalachians are covered in trees and have plenty of game... (meaning they have a good shot.
I think you can see that the location will likely end up defining the outcome.
Keep in mind the following:
- Weather (including the seasonal changes)
- Game availability
- Fuel availability
- Shelter availability
- Foraging availability
These will be the primary factors, you can set them as necessary for the scenario you want.
Bonus: Does the time spent change based on whether they stay in one
place or are on the move?
Probably not. Two people are not going to make a major dent in the availability of food in a wild region. They will want to vary where they forage day over day (no reason to forage an area you already picked clean) but they aren't going to be hunting herds to extinction, predators will kill and eat more than they will.
Also Bonus: If the people don't have access to hunting equipment, such
as guns or ammunition, how does that affect the answer?
Again a lot depends on the scenario, but at the very least it will be harder to get started. A gun gives you a quick easy kill. Without it you have to rely on traps or something similar to get meat which is going to take more time than shooting a deer and eating it.