1/2 cup
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4 slices of bread should equal about a cup (maybe a little less) of bread crumbs (in the food processor). This amount would increase if you were looking for "bread crumbs" that were larger, say croutons, or "cubed". With cubed bread you may get even 3-4 cups out of your 4 slices.
Keep in mind this is assuming you are talking about standard store-bought sliced bread, not an artisan bread or a french bread or something like that.