>>105699693
A woman only works ~40 out of her ~80 year lifespan because she needs "bringing up", "education" and "retirement".
During her working years she will spend most of her day off work sleeping, eating, shitting and whatever else woman do in their "free time". And on top of that she asks for "weekends" and "sick days" and "holidays".
So out of 8760 hours in non-leap year she will only work 1766.
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(40 years / 80 years) * (1766/8760) = 10,08%

If a robot only had 10% uptime you'd throw it away.