I did read that Zuzanna only works 4 days a week and will also use her leave from work. I have managed 28,500 miles (45,000km) while working full time and doing that mostly entirely on Audax rides, shopping and commuting, which isn't the easiest way to do it. It wasn't in my interests to spread the load and pinch miles on my commute, unless I was going for a 200km DIY. So my rides were all loaded on the weekends or holidays. Spreading the load is much easier, as Pat Kenny did when he was cracking out over 50,000km a year while working full time.
It's definitely tough, but I think quite achievable, especially if you only work 4 days a week instead of 5.