Is there a way to compute the size of a hash?

I have a hash of hashes of hashes etc... and need to know how many items exist 
in the second hash. I know they are always named as integers from 0 up. I was 
hoping to get info I need out of with a loop incrementing up until etc.

Does such a method exist, or is there a better way? Could I reliably just start 
the loop and expect a certain error I could trap and stop on once I increment 
the hash value up to far instead?

Thanks!
jlc

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