Posted By Bill Elliott
Steve - depends on a number of factors such as - the working temperature of the store, the thermal protection of the clothing, what activities are being undertaken in the store etc. You should also take into account whether the motor/door interlock means that work can be undertaken inside without the chiller unit actually blowing (if the unit is still blasting out cold air)or if it is OFF - if so, the temperature inside the unit will start to rise and may have food safety implications, condensation and ice build up and so on.

Posted By Gareth Smith
I worked within a cold storage facility many years ago now, an industrial freezer.
the temp was a constant -32 degrees, we were issued with protective clothing, footwear, hand protection, once accustomed to the cold temp is was a normal environment, there was no specific time scales that we had to adhere to, even with the motors running and continually cutting in to re-cool the area of around 40000 sq ft, it was actually appeared to be warm. correct protective measures administered, and i think that an 8hr day would be well within limitations that may well be active today.