Re: Online classes
I can’t speak for what americans/canadians call lab time, but in the UK labs are regarded as a study space. EG a computing lab is where there is a room full of computers open to everyone where a student can study in their own time or is used as classes (seminars).
“It’s lab time” = It’s seminar time.
For me personally, lab means laboratory and is linked to medicine/science. It irks me when they call anything else a lab, like calling a computing room a lab? I don’t get it, my university calls computing rooms “labs” “clusters” or just “rooms”. Weirdos.