You can make up more burritos than you'll eat right away and keep the remaining burritos in the fridge and have them the next day. Usually I would say guacamole is not a great thing to keep overnight, but wrapped up in a burrito that is then wrapped up in foil and kept in the fridge overnight, it lasts just fine. We did this and had leftover burritos for lunch the next day and they held up perfectly in the fridge overnight. I wouldn't keep them for longer than that though.