I have experience in several offices across Europe, particularly in McKinsey and Company.
Nowadays, consulting companies are being more and more aware about the challenges it emcompasses for women, and they are implementing policies to facilitate conciliation. For instance, in McKinsey Iberia -Spain and Portugal- you can work part time after maternity leave -that is regulated by country laws-.
However, working from 9am to 9 pm is considered alraedy a "very good lifestyle", which can be tricky for mothers. However, I have seen many cases in which the moms leave earlier (18h), spend some time with their kids and put them to bed, and then continue remotly from home.
Hope it helps!