Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


changes in our performance retention awards during 2009 were as follows : shares ( thous. ) weighted-average grant-date fair value . <table class='wikitable'><tr><td>1</td><td>-</td><td>shares ( thous. )</td><td>weighted-averagegrant-date fair value</td></tr><tr><td>2</td><td>nonvested at january 1 2009</td><td>873</td><td>$ 50.70</td></tr><tr><td>3</td><td>granted</td><td>449</td><td>47.28</td></tr><tr><td>4</td><td>vested</td><td>-240 ( 240 )</td><td>43.23</td></tr><tr><td>5</td><td>forfeited</td><td>-22 ( 22 )</td><td>53.86</td></tr><tr><td>6</td><td>nonvested at december 31 2009</td><td>1060</td><td>$ 50.88</td></tr></table> at december 31 , 2009 , there was $ 22 million of total unrecognized compensation expense related to nonvested performance retention awards , which is expected to be recognized over a weighted-average period of 1.3 years . a portion of this expense is subject to achievement of the roic levels established for the performance stock unit grants . 5 . retirement plans pension and other postretirement benefits pension plans 2013 we provide defined benefit retirement income to eligible non-union employees through qualified and non-qualified ( supplemental ) pension plans . qualified and non-qualified pension benefits are based on years of service and the highest compensation during the latest years of employment , with specific reductions made for early retirements . other postretirement benefits ( opeb ) 2013 we provide defined contribution medical and life insurance benefits for eligible retirees . these benefits are funded as medical claims and life insurance premiums are plan amendment effective january 1 , 2010 , medicare-eligible retirees who are enrolled in the union pacific retiree medical program will receive a contribution to a health reimbursement account , which can be used to pay eligible out-of-pocket medical expenses . the impact of the plan amendment is reflected in the projected benefit obligation ( pbo ) at december 31 , 2009 . funded status we are required by gaap to separately recognize the overfunded or underfunded status of our pension and opeb plans as an asset or liability . the funded status represents the difference between the pbo and the fair value of the plan assets . the pbo is the present value of benefits earned to date by plan participants , including the effect of assumed future salary increases . the pbo of the opeb plan is equal to the accumulated benefit obligation , as the present value of the opeb liabilities is not affected by salary increases . plan assets are measured at fair value . we use a december 31 measurement date for plan assets and obligations for all our retirement plans. .
Question: as of december 31, 2009, what was the number of non-vested shares?
Answer: 1060000.0
Question: and what was the remaining compensation expense for the unvested awards?
Answer: 22000000.0
Question: how much, then, does this expense represent in relation to that number of shares?
Answer: 20.75472
Question: and what was the weighted-average period over which that remaining expense was expected to be recognized?

1.3