Facts It is said you need 10,000 hours to master a skill. If you spend 3 hours acquiring a skill, how many days does it take to spend 10,000 hours at it?By Alex WilliamsJanuary 31, 2024 What is the equivalent of 10000 hours? Almost 11 years of deliberate practice for 4 hours on the working days. The real value is somewhere between 6 and 10 years.