The time it takes to fully roast a Turkey will depend on the size of the Turkey.
Roasting a Turkey though typically takes 45 minutes to an hour and you'll know when the Turkey has fully been roasted and cooked when the internal temperature of the Turkey is 165 F in the thigh of the Turkey.
Make sure to Thaw the Turkey for 3 to 4 days in the refrigerator first so that the Turkey will cook faster.