Is a 23lb turkey enough for 15 people? How long should it stay in the refrigerator to defrost?

A 23 lb turkey will be plenty for 15 (they say 1 pound per person, so you should have enough). In our family we have so many side dishes that we may not eat as much turkey as some families. If it's frozen now you need to take it out today and put it in the fridge to get it thawed by Christmas. That's a large turkey and it will take many days to thaw it completely. If you're serving it on Monday be sure to check on it Sunday afternoon to see if it's thawed. If not you may need to run some warm water through it and put it back in the fridge. My family ran into that problem at Thanksgiving. The 20 lb turkey had been defrosting for 3 days and wasn't even close to thawed out when we got ready to put it in the oven. We had to run warm water though it and sit it in the sink to thaw. Needless to say our dinner was much later than expected.