There may be times when you price labor in an hourly manner, say 60$ per hour, and sometimes you would want to charge the customer for one and a half an hour. You can make use of UOM in this scenario.
A brief on the steps to be taken:
1. Adding Per minute under UOM
2. Creating labor products with per-minute cost
3. Adding this to the quote block
Adding Per minute under UOM
Please navigate to Settings > Custom fields > View fields under Product > Edit UOM > Add Per minute.
Creating labor products with per minute cost
Create a product with UOM as per minute and add the cost for one minute, say your the labor cost is 60$/hour so you add the cost per minutes, that is 1$.
And hit save.
Adding this to the quote block
When the product is added in the quote block it would display the Price per minute, Quantity and the total cost.