From Space Exploration
Lifesupport window from Space Exploration mod for the game Factorio

Life Support is required to survive outer space and other hazardous environments. Space includes orbits, asteroid belts, and asteroid fields. While life support is required, the Life support canisters in your inventory automatically deplete and are replaced by Empty life support canisters. Once those run out, you should seek the safety of a Space capsule, Spaceship, or return to a planet! Certain equipment, if installed in your suit, can extend the working life of your canisters; while other recipes can let you clean and refill empty canisters. For the base Thruster Suite, at 100% efficiency, the duration of a single life support canister is 1:40s.