The hand-wavy allusion to "research" seems to be ending at: https://www.nber.org/papers/w18702 https://www.nber.org/papers/w18702 Which shows at least for Norw

The hand-wavy allusion to "research" seems to be ending at: https://www.nber.org/papers/w18702 https://www.nber.org/papers/w18702 Which shows at least for Norway and Sweden women participation was on the increase for the study. So maybe it's not the leave of 9+ months that's the problem, but that in combination with other factors? A blanket statement that one year is too long, sounds like bullshit - when the listener is in one of the Scandinavian countries, anyway.