[Partisan Gunslinger]

Should I cook the two turkeys together estimating the total time based on 25 pounds?

Since the cooking time is estimated on the thickness (which parallels the weight) of the bird, it makes no difference if you have two birds in the oven. Cook them both as if there were one (if they're the same weight), for a 12.5 pound bird in your case.

[Klutz Dohanger]

Since the cooking time is estimated on the thickness (which parallels the weight) of the bird, it makes no difference if you have two birds in the oven. Cook them both as if there were one (if they're the same weight), for a 12.5 pound bird in your case.

You still have to account for the volume. A full oven always cooks a bit slower than a single pan dish.