No mention is made of number of signatures in a day, just a 'boast' of how many trades can claim similar.
In the example of a supplier then an easy example off the top of my head is DG declarations. An IATA DG declaration is a legal document, incorrectly packaged DG consignments that have gone on to cause incidents on a/c have resulted in IATA DG declaration signatories receiving custodial sentences.
As is the IMDG Dangerous Goods Declaration on a shipment going by sea; one of the few documents (like the IATA version) where the signatory will end up in the dock, along with the head of the organisation who runs it.
I probably sign on average about twenty to thirty entries per day that are legal documents and for which I can recieve a custodial sentence, I can also recieve a custodial sentence for missing items that I should have checked and signed for.