I think this is the limit for a 4 x 8 layout. I have more than 169 feet of track in this layout. It’s all Kato Unitrack DC with three separate tracks. On each edge there are nine lanes with
Double Decker
I change my layout often. Nothing is permanent. I purchased three pieces of pegboard and use those as a base. They offer a good flexibility in how large I can arrange my layout and are very inexpensive. My last layout