Spoony Cooks will offer a chef service for 2 nights minimum, with the exception of the peak weeks ( New Year, Half Term, etc). Chez Toi will offer a minimum of 5 nights.
However, with the meal delivery services you have complete flexibility, with Bon Appetit you put your meals in the freezer and use them when you want, with Direct Dining, they will deliver for just one night, they cook the meals in the morning, deliver in the afternoon and you heat up in the evening.