Final answer:
Garlic Parmesan is generally good for around 4 hours once placed on the makeline rail.
Step-by-step explanation:
Once garlic Parmesan is placed on the makeline rail, it is generally good for around 4 hours. However, this can vary depending on specific food safety guidelines and regulations followed by the establishment. It is important to discard any garlic Parmesan that has been sitting on the makeline rail for more than the recommended time to ensure food safety and prevent the risk of foodborne illness.