I assume that you are self-employed and create products that you are selling. If this is correct, your overriding concern is how much money you absolutely need to make a living. To achieve this fixed target, you have three variable components - the # of hours you are working, the # of units you are able to sell, and the $ price per unit you are selling your products at in a given period. (week, month,..)
In order to achieve your target, you must be able to sell the assumed # of units at the assumed $ price. Otherwise, you have to work longer hours if that is possible or increase the sales price per unit. If your calculation shows that the unit price you plan to sell at is below the market, you can sell at a higher price and work fewer hours or continue to sell at a lower price to increase your sales and increase your standard of living (your target) Being self-employed, your hourly rate is a function of all the other components.
If you are creating a few products that require more time and/or are sold at different prices, break your daily hourly time record down by type of product. The total income must still match your targeted Income.
If you are doing this activity as a part-time business, divide the income the products generated by the number of hours you worked. Whatever that number is, you have to decide whether the part-time business is worth your time or whether the time could have been either used for more profitable activities or spent on some hobby projects, if you can afford it.