Genghis the Hutt:
DarkLightHitomi:
The funny thing is, they tell you how much volume is in a portable hole, and tell you how long a volume of air can last a character. ... why don't they match?
Probably because the internet didn't when D&D was put together and they didn't want to pay a reference librarian to go figure it out for them? Personally, I have no idea how long the air in a bag of holding *should* last for. Is it more or less than 10 minutes?
You misunderstand. They wrote rules for how long air lasts (can be found under suffocation in envirnmental rules). They would only need to research the they are writing.
The rules say that a medium creature can breath for 6 hours in a 10' cube of air. That boils down to about 1 minute per 3 cubic feet.
A portable hole opens a cylinder 6' wide and 10' deep. That comes out to about 283 cubic feet.
Put the two together and a portable hole has enough air to last a medium creature about 101 minutes, minus the volume of the creature.
A human is about 9 cubic feet, so that reduces the air by about 3 minutes.
So a medium creature in a portable hole should have about 98 minutes of air,
by their own suffocation rules, yet they override that and give a portable hole only 10 minutes.