What is the max length travel trailer you think is practical

For my wife and I, our 17' works great. We don't have kids traveling with us anymore. We use our TT as a very comfortable tent. We sleep in it but are outside most of the time. We also have some property where we frequently have 20 r 30 people camping with us. A larger trailer would be in the way.
We take off for one or 2 month long trips every year and love the ease of using this length trailer. Set up and tear down is super easy.