I went part-time, <15 hours/wk, at 23 weeks, and then stopped altogether at 28 weeks. DH would have had me finish even earlier if he could have - my workplace was disease central, there was a fair bit of manual handling involved, and while I was comfortable, I could see that my team weren't. So I left. It was tight, financially, but being at home longer I could do a lot of stuff that saved us money because I had plenty of time. Baby was born just shy of 42 weeks, so that's 13.5 weeks that I had on mat leave! I look back on the time incredibly fondly.