In this situation, even Feng Yi could only hold out for at most another day or two. Feng Yi's bottom line was to wait for one day. If after one day, the shuttle still refused to leave, his only choice would be to expose himself and then quickly flee into the distance.
As for Feng Yi's endurance, he could barely hold on for 2-3 days, but by that time, even his body would be in danger. He must reserve enough strength to return, enough strength to fight, enough strength to deal with any emergency. Considering that beyond this stage his body might experience unpredictable issues, sometimes when a person suffers from frostbite, you might not even realize that you've been affected. When someone in extreme cold suddenly feels a wave of warmth around them, it means death is not far off.