The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.forge.api.event.FurnaceFuelBurnTimeEvent;

FurnaceFuelBurnTimeEvent extends Event. That means all methods available in Event are also available in FurnaceFuelBurnTimeEvent

Name	Type	Has Getter	Has Setter
Name burnTime	Type FurnaceFuelBurnTimeEvent	Has Getter true	Has Setter true
Name itemStack	Type IItemStack	Has Getter true	Has Setter false
Name recipeType	Type IRecipeManager<Recipe<Container>>	Has Getter true	Has Setter false