pork fillet cooking time
Every Kitchen needs a meat thermometer. Little too late in this case but it would have saved you here. I never used one at home until after I started working in a restaurant that only had a flat top and a convection oven with burgers on the menu. I got a relatively cheap one for $5-10 at Wal-mart and it does the job.  Another option for next time is to check your meat often and poke it with a spoon, once it feels firm throughout, like the skin on the back of your hand when you make a fist, it's done.