The adventurers learn that the mob boss demands a minimum of 12 watches and 30 rings to be sold every day, and has figured out how to get what he wants while paying his two workers the least possible amount (while still honouring their agreed-upon hourly wages). While Lara and Harrison can't tell how many hours each worker spends selling the jewelry, or how many items they actually sell each day.

How long do the two workers sell jewelry each day?
How many counterfeit watches and rings do they sell each day?

Without knowing the number of hours each worker spends selling jewelry or the number of items they actually sell, it is impossible to determine how long they sell jewelry each day or how many counterfeit watches and rings they sell.

To determine how long the two workers sell jewelry each day and how many counterfeit watches and rings they sell, we need more information. Specifically, we need to know the total number of watches and rings sold each day and the agreed-upon hourly wages of the workers. Could you provide these details?