Final answer:
Frosty machines should be primed no earlier than 30 minutes prior to opening.
Step-by-step explanation:
Frosty machines should be primed no earlier than 30 minutes prior to opening. This allows enough time for the machine to properly chill the ingredients and ensures that the frosty served is of high quality. Priming the machines too early can result in the frosty being too soft or not properly chilled.
Learn more about Frosty machine priming