Food safety experts at the USDA say if you've waited until the last minute to get a turkey -- fresh is best. Unless you plan on bowling with your turkey -- frozen birds may not be thawed in time for thanksgiving dinner. It takes about 30 minutes for every pound of turkey to get your frozen bird defrosted.
To avoid cross-contamination when wrangling with a raw turkey -- keep meats separated from other food. The pop-up timer can be a good indication the bird is ready. But a meat thermometer is the best way to make sure your turkey is cooked completely -- and it must read 165 degrees Fahrenheit. One last safety tip, experts recommend getting leftovers in the fridge within 2 hours to avoid bacteria growth.
If you're cooking two turkeys in one oven -- you don't need to double the cooking time. Just go by the time it takes to cook the smallest one, and the larger one should be done soon after.