(You can make it so that you can time the self-destruct to 15 minutes, which would be enough for a large amount of reinforcements to arrive, and enough to be boarded. There is a possibility that there wouldn't be enough escape pods, nor enough time, as as you run towards the escape pods, seats are taken. You would have to go across the entire ship, and that would take more than 15 minutes, especially since there would be panic and such. So, it's better to wait for reinforcements to arrive and save the ship, or wait 15 minutes for a good amount of enemy troops to be on board and blow it up, killing everyone on board, and probably even the boarding ships, than blowing up the self-destruct sequence unnecessarily.)