I had the Cutera laser treatment on my face yesterday and I broke out in hives. How long will this last?

Hives or urticaria are not normally associated with laser procedures. However, hives can occur as allergic reactions to oral or topical medications or foods.  It may be that you were exposed to something that caused an allergy.  I would recommend some antihistamines to calm down the hives, and hopefully, they will go away within several days.