It really depends. Your stats naturally drain very slowly. However, certain things will increase this rate.
Hot weather makes you drain water more quickly due to sweat, while cold weather makes your body burn food to stay warm.
Running costs stamina. Draining stamina costs water, replenishing it costs food.
If you're injured, your body will consume food more quickly to repair itself.
So if you're hurt and running everywhere and it's cold, you'll go through food quickly. If you lay down in a nice temperature, it can take a long time.