How much is the notarized power of attorney for house sale consultation? How long will it take?

This is nothing special. Each notary office charges different fees, generally around 200 yuan. If both parties are present and the procedures are complete, it can usually be completed on the same day.

Identity cards/temporary residence permits/household registration books of both parties. I suggest you call the local notary office for detailed consultation. Notary offices are different all over the country.