Camping for 2 nights in January

Recently my friends and I have been planning a trip to the top of a mountain in the whites that we have overnighted on multiple times before. We stay in a first come first serve, non staffed hut near the summit and have only ever gone for one day trips. The latest that one of us has done this was in mid November this year, but my friend is insisting that we stay in the hut for 2 night (both of which will be below freezing for the entire 24 hours, other than this conditions are decent) and just hang out near the summit for the second day. How do I convince him that this is a bad idea and we will be miserable?