Why don’t you ask for a sabbatical instead? You need three months off to find out what you spend, what you would be doing...
Not a bad idea and I'll give it some more thought but here are my initial concerns.
We'll need much longer than 3 months to figure out what our spending will be. I can figure out what a typical month's budget might look like covering housing, food, transit, entertainment, utilities, healthcare, etc. Although given how frequently we typically change our lifestyle, even that is hard to nail down for the long term. What I can't figure out at all right now is what our appetite for less regular purchases such as travel, hobbies, etc.
We are looking for a house and I would much prefer carrying a mortgage at today's interest rates to pulling all that cash out of income producing assets. I imagine being on sabbatacle would make that difficult.
My RE plan isn't really full RE anyways. I would plan on picking up consulting engagements in this industry anyways. Both to stave off boredom and as a hedge to keep me employable at my current level in case we have some investment downturns or changes in expenses.
I also don't think I'd go back if I took off 3 months straight right now.