5'10" is the same hieght as me. You want to go from 224 to 170lbs you need to lose 54lbs (I know you could have done the math yourself). Losing that much fat (not wieght) should take you 27-30 weeks. If you want to keep the lean muscle you have plan on losing NO MORE than 2 lbs per week. It will be a long hard road and you probably won't even notice a difference until 4-5 weeks into your diet (I speak from experience) but stay focused...visit the board, ask questions, get advice, anything to keep you motivated. Good Luck bro...train hard.

Pete