You can daisy chain a maximum of 5 lots of 5m provided every cable is an active extender (the ones with the small matchbox sized female heads where they connect - they retail for between $30 - $50 each).
I have done in reliably with 3 * 5m - 5 * 5m can be a bit dicey - should work with a bit of luck! Try it a step at a time.
PS
If you're going to add a hub - make sure its a powered one - else you're in for disappointment!
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