Coomerical Gelato/Ice Cream Making

Anyone work in a gelato or ice cream shop that made it’s own product? I have some questions:

Did you need to pasteurize your gelato mixture before freezing it?

Did you need to “blast freeze” your gelato after making it, or was curing it in a regular freezer (-10 F) enough?

How long could you keep your gelato before throwing away any left overs?