The assessment list shall be completed on or before July 15, and, on the first Tuesday in August in each year and from day to day thereafter, Sundays excepted, the board of directors shall sit to hear complaints and to correct errors in such assessments until all complaints filed with the secretary are presented to the board of directors and have had an opportunity to be heard and have been determined. The classification of any lands on the graduated scale shall not be changed or determined at said hearings.
C.R.S. § 37-44-120