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It all depends on how big the unsupported spans are.
Thick coro = few support ribs
Thin coro= more
and everything inbetween.
Was that helpful? By itself, perhaps not. If you have coro of a certain thickness already I'd say start out with minimal supports and go by feel, judgement, and road test experience to add more supports as needed. For example if I made a bellypan of thin coro with few supports and I could push it up between supports more than, say, 2" with light pressure by hand, I'd consider adding enough crossmembers to bring the rigidity up.
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