I average 2-3 months for every 100 rooms in an area. My areas are usually 100 rooms or 200, I tend to not build in incriments of 50 if I can help it (seems off to me).
If I'm inspired in an area, I can do it in a month, but that's rare. There's something about doing 10 rooms a day or more that just burns me out, so I try not to do it.
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