how much is it cost to stay in hourly longue in Beijing Capital Airport?

The price varies to the duration you stay in the airport and which terminal you stay.
For instance, a standard room in T2, the price is 80RMB for one hour, 120RMB for two hours, 150RMB for three hours, 180RMB for four hours, 220RMB for four to six hours, 260RMB for six to eight hours, 300RMB for a overnight room.
If you stay in T3, the price is a little bit high.
For detail information, it is suggested to look on the official website of BJ airport.