In the fine tradition on Breakable 'Standard' Equipment by Capt Murphy I have written an OXP that simulates the breakage of a Life Support System. If your LSS gets broken in battle, you have about 15 minutes of time to reach anything dockable.
Breakable Life Support System OXP ver 1.1 (7.12.2012)
Author: spara (Mika Spåra)
This oxp adds a new breakable standard equipment and simulates it's breakage when damaged. When damaged, LSS will have emergency power to produce air for 15 minutes. When going down, LSS will notify you once a minute. After LSS has shut down, you have about one minute of time before you'll lose your consciense and die.
A damaged LSS will be fixed for free when ever you dock into anything dockable.