Required:

A pension plan is obligated to make disbursements of $$3\mathrm{.}2$ million, $$3\mathrm{.}9$ million, and $$3\mathrm{.}2$ million at the end of each of the next three years, respectively. Find the duration of the plan's obligations if the interest rate is $10\%$ annually. $($Do not round intermediate calculations. Round your answer to $4$ decimal places.$)$

Duration $$