It does not matter how many days, you think it will take, You get charged by the board to hang and by the board to tape, additional for corner bead, bullnose, and radius work that will get you 3 coats if you want a skim coat which you should always get it is also additional. Generally its about $100 per board to hang and tape,if you have a good amount of boards. If its only a 10 board job, you will pay more per board. Anything less than that and you are getting a hack to come in. But this is long Island and there are many tradesmen who will pull their pants down just to get a job oh yeah and the no speakie people as well.Taping & Spackling. 1 day for each coat. 3 days of work. I have all the materials. Just need someone who does nice work.