On weekdays, women in households with young children spend twice as much time caring for the children as men do. On weekends the ratio is only 1.5-to-1. Details on the chart, which has grid-lines at 6-minute intervals (click to enlarge):
Source: Bureau of Labor Statistics.
These are averages per day calculated from time diaries recording the “primary activity” at each point in the day. Note that this does not do anything with marital status or household composition, so a lot more of these women are single mothers. That’s not a flaw in the presentation, though. Part of having a lot of single mothers means they spend more time with children, as these data show.