A third reaction mixture was made up in the following way: 

5 ml 4.0 M acetone  +  20 ml 1.0 M HCl  + 5 ml  .005 M I2  + 20 ml H20

If the reaction is zero order in I2, how long would it take for the I2 color to disappear at the temperature of the reaction mixture in Problem 3? 

This is for question 4 of the ASA on Iodination of Acetone Experiment 20.