How long does the procedure of selling your house & somebody buying it take?

it depends on when stated in your contract after the final step in escrow instructions.

once some one signs the sales contract, it usually takes about 15-30 days to close. But if you are talking about listing to actual title transfer, that can take a while. You have to start with prepping your house for listing. this includes cleaning, painting, removing most of your personal effects, etc. then the actual listing time. some markets are slower than others. I can't say for certain because it depends on your market. your local real estate agent or news paper should be able to help you on the market conditions and what the average time a property stays on the market.