@Nine what does this mean?
@Felthry It's a reference to the hidden easter egg in Gunstar Heroes' second Timeron encounter. Timeron is a boss that in the second encounter in space that shows up and displays the message "How long can you last??" with a timer. The boss lasts until either A) you are destroyed by the ever increasing Bullet Hell that gets worse and worse as time goes on, B) you shoot it even a little bit as it's very easily destroyed, or C) you last 10 minutes.
@Felthry I think it's basically a joke by the programmer going "oh jeez I give up, you win, haha, congrats for lasting 10 minutes against this hell, clearly you're on some zen shit", considering that a kinda spooky laugh sample plays when you get the bonus.