Are you seriously saying that women without children at home having less free time is now somehow society's problem? You don't just "have less free time" automatically. It's probably because you choose to do more housework, which is exactly what the study says ("they spend about six hours more than men doing household work").
Don't want to do it? Cool, practise for a tournament all the time, don't do more housework, and take the risks that come with that. There are tons of lonely male nerds who have untidy houses and excellent tournament records. You are very welcome to join their ranks. In fact they would probably be glad to have more female participation. I on the other hand will err on the side of a more tidy house, and no medals.
Don't want to do it? Cool, practise for a tournament all the time, don't do more housework, and take the risks that come with that. There are tons of lonely male nerds who have untidy houses and excellent tournament records. You are very welcome to join their ranks. In fact they would probably be glad to have more female participation. I on the other hand will err on the side of a more tidy house, and no medals.