During thier peak periods they can put a minimum legnth of stay on there or a maxim legnth of stay. In other words any one booking this hotel will have to stay two or three nights minimum during that period. It helps the hotel maximize thier revenue and it also prevents a lot of headaches down the road. Calling to amend the conformation later won't do you any good unless they have a serious drop volume and people are not booking which is very unlikely. The min or max will usually be in place untill the last minute