You are considering a project with an initial cost of $$8,600,$ and cash inflows of $$2,100,$ $$3,140,$ $$3,800,$ and $$4,500$ a year over the next four years, respectively. The required rate of return is $10\%.$

What is the discounted payback period for this project? $($Please do not round your intermediate calculations. However, round your final answer, if necessary, to two decimal places and enter it without the units$)$