When I taught high school chemistry, this is what several local school districts did. Every sixth day would be a double period, and we could fit quite a bit into that time period.
I would have to have equipment out but I would not set it up unless the lab was very long. Writeups (pre- and post-lab) would happen outside of class.
In college, lab classes were separate from lecture classes, and far longer (I seem to remember four-hour labs, but I'm not positive about that.)