Air Golf has decided to sell a new line of golf clubs. The length of this project is seven years. The company has spent $109,102 on research and development for the new clubs. The plant and equipment required will cost $2,857,228 and will be depreciated on a straight-line basis. The new clubs will also require an increase in net working capital of $132,990 that will be returned at the end of the project. The annual OCF of the project will be $893,162. The tax rate is 34 percent, and the cost of capital is 11 percent. What is the payback period for this project? (don't round calculations)