Time is not a currency
Traditional job ads still define the number of hours per week you will be expected to work, along with a list of traits, skills and experience you are expected to have. Very rarely do they specify what the hiring manager would like you to achieve and allow you, as the candidate, to define the skills and experience needed for success, and the routes to get there.
As freelancers, we are in a position to embolden the movement in the latter direction. It’s why we work to how we provide value, not the number of hours we spend at a computer.
If you are using time as a currency, you are almost certainly losing out on the rate.