This is my first post here.
We are having a dinner party - menu:
1) Pork tenderloin. Recipe is for 1 lb roast. we're having 4 lbs. But
basically it is still a tenderloin. (not any thicker - just longer).
Recipe has cooking for 25 minutes.

2) Potatoes. REcepie calls for 45-50 minutes

temperature for both is 375. We have a convection oven. Recipies are for
conventional oven. I've read that with convection you should be able to
lower cooking times by 25%.

Question - given the above recipies and how we're increasing the portion -
I'm at a loss as to how long to cook everything.

Suggestions would be most welcome