What is the roasting time per pound for a spatchcock turkey breast?
The answers duck the question.  No, you don't determine doneness by time, only by temperature, but when you're planning a meal, you don't want to have the potatoes done and still have to wait two hours for the turkey.  So, you CAN estimate cooking times based on research/experience.  I smoke my turkeys so I'm smoking at about 250F.  I also spatchcock the birds to even cooking and speed cooking times.  But I know I can figure ROUGHLY 15 minutes per pound for whole turkey or breast.  If you cook a whole bird or a whole breast not spatchcocked estimate ROUGHLY 30 minutes per pound.  If you're roasting at higher temps, cut your estimate to probably 12 minutes per pound spatchcocked, and 20-25 minutes per pound not spatchcocked.