You are working as Chief Financial Officer for your friend's start-up business. She has asked you to evaluate a project that costs $165718. She estimates the project will have cash flows of $41711 in year 1, $52572 in year 2, $42767 in year 3, and $93560 in year 4. You estimate a required return of 14.61%. What is the payback period of the project in years?