Potassium chlorate is prepared by the electrolysis of KCl in basic solution $6{\mathrm{OH}}^{-}+{\mathrm{Cl}}^{-}\to {\mathrm{ClO}}_3^{-}+3{\mathrm{H}}_2\mathrm{O}+6{\mathrm{e}}^{-}$  . If only 60% of the current is utilized in the reaction, the time (rounded to the nearest hour) required to produce 10g of  ${\mathrm{KClO}}_3$ using a current of 2 A is______(Given: F=96,500 C ${\mathrm{mol}}^{-1}$ ; molar mass of ${\mathrm{mol}}^{-1}$  )