It is your game. You as developers can do whatever works best for you. But in my opinion this mission is flawed in its design.
It's just not fun, to fly the same mission over and over again, just because at the end after 45 minutes, the devs decided to torture the player with capship missiles. The "try again" premise doesn't work properly, because you have 40 minutes of idle time, before the heavy stuff come up again.
And skipping the mission is not such a good solution either. Most flyboys will grind their teeth and try the mission again, and i think most of them won't skip(pride), but just lose interest and play something else.
As i said before, you devs can design this mission as you see fit, but i stopped playing at this point.
But in the end i really can't complain. I didn't pay anything, i had fun up to this point, so thanks again for all the fish