I hatch 90+ birds at a time, basically every 24 days. In the summer I can keep everything under control, it is warmer outside and I can keep everything in the barn with really little effort, even with constant cleaning. In the winter, with Temps in the single digits, I move everything to the basement. So depending on how quickly I advertise and sell the chicks or wait them out if I'm crossing breeds for something particular, at given day 90 to a few hundred birds.