Similar for us, though we probably had the occasional week's break and times when the kids wanted to play the games again so we didn't move on for a while.
We didn't do every activity listed, but I selected the experiments that were do-able in advance and sorted out any resources we might need. We did The Elements with my eldest and middle child when they were probably 12/13 and 10, and then repeated it again with middle and youngest at the same age.
I'd definitely recommend photocopying/preparing all the games and gathering materials needed for The Elements before starting, otherwise the temptation might be to skip the fun stuff. The games are good for helping them understand concepts, so although it takes a bit of prep they are well worth it. If you have another child to join in with the games, even if they are a little young for the content, it makes it more fun.
Carbon Chemistry is definitely more advanced, a little less 'hands-on' and with fewer games, but a good follow-up to The Elements.
Theodore Gray's 'The Elements' is a nice pictorial book that complements Ellen McHenry's The Elements well. It's not a textbook, rather more a browsable 'coffee table' book, but is good for visual learners or those who are less inclined to reading textbooks :)
btw I definitely recommend both her chemistry curricula. My eldest's only experience of chemistry was Ellen's resources and he went straight on to a chemistry exam course afterwards. It was excellent preparation. I did chemistry A level (UK), but understood chemistry far better after doing The Elements and Carbon Chemistry with the kids :)