[asid61]

I should fine-tune my previous answer.
For the vast majority of those who participate in robotics, there is no comparison to those who play sports. Sports requires a much larger time committment than FRC for almost everybody in FRC.
But, if you are in the tiny margin of people that spend hours and hours working, then the time you spend is comparable to the tiny margin of sports; personally I spend anywhere between 6-8 hours of FRC stuff on weekdays, and more on weekends. Once it gets to the point where all free time is spent on something, it is no longer a question of who is spending more time, but rather a question of who has more time to spend.