Edward, you start with 4-foot lengths, but then you adjust those down as the situation demands. For example, if it is a hot night, you might want to "raise the flaps" to get more air circulating under. So, you will move the stakes out. If it is a rainy night, you might want to lower the flaps to keep rain out, so you may move the stakes in. If there are too many large rocks to stake into, you might need the length to move them back out to softer soil.