German 3rd ace Gunther Rall was shot down 8 times. With his 275 kills that makes 34 kills per "death" so to speak. Quite a few allied aces topped that.
However aces like Glunz or Marseille have a better record in that sence, - while others like Rudorffer had to bite the dust 18 times!!
I knew the Icelandic ace, Tony Jonsson some bit. He spent some 500 hrs + on combat missions, returning from WW2 with the humble score of 9 planes or so. However, most of those were deep over enemy territory, - just an engine failiure would have done it for him there. Missions were all sorts, Rhubarbs, Circuses, Scrambles, Night patrols, Bomber intercepts, Sweeps, Deep escorts (i.e. Berlin), and then the dirty work, dive bombing, Train/tankbusting and V-1/V-2 raids along with V-1 intercepts.
From his startup having a solo dogfight against 2x109's in his first sortie to doing cold and boring escorts to Berlin, things changed a lot. All the way from a hostile sky full of bandits into days and even weeks without even spotting an enemy plane.
In the course of events however, most of his buddies either got killed, captured or rotated.
Anyway, such would be the fate of so many an allied pilot. Fighting deep over enemy territory, doing very dangerous ground jobs, getting long rotations/rests, being moved out for instructions and then again, for the last part of the war, not finding anything to shoot at.