What must you do if time that potentially hazardous food is held between 41ºf and 70ºf exceeds the 6-hour limit?

Answer : Throw it away

Explanation:

Potentially hazardous food should be kept below 41 degree F  to prevent the growth of any microbes. If this food is held between 41 - 70 degree F for more than its 6 hour limit then there is a rapid growth of microbes in it as this is  the optimum growth temperature for the microbes and hence, the food becomes unsuitable for consumption.

So, after the food exceeds its 6 hour limit when held between 41-70 degree F it should be thrown away.

substitution is the answer in this case