A material was dried in a tray drier using constant drying conditions. When the initial moisture content was 0.3 kg water/ kg dry solid and 6 h was required to dry the material to a free moisture content of 0.008 kg free moisture/ kg dry solid. The critical moisture content is 0.16 kg water/ kg dry solid while equilibrium moisture content was measured to be 0.02 kg water/kg dry solids. Assuming the drying rate in the falling rate region is capillary flow controlled, calculate the time to dry the material from a moisture content of 0.35 to 0.06 kg water/kg dry solids.