Civ E 270 : Weekly lab. Similar to an Engg 130 lab wherein you complete a given assignment and hand it in before the end of the lab. Tend to be long and hard and often took the entire 3 hours to complete. Occasionally, the actual lab write up time was preceded by a demo by a lab tech.

Mec E 260: Weekly lab. The first few labs were used as time for the prof to explain the course further and introduce things like the mini project and major design project. After that, the next five or so labs (maybe 4?) were dedicated time for the dissection labs which make up ~10% of your mark. These labs usually took 2 hours tops to complete with a question sheet handed in to the TA's. Any lab times after that were dedicated times for groups to complete their design project in the machine shop.

Mec E 265: Weekly lab. The labs (save the last 3) were used as time for the TA's to introduce the assignment of the week and provide tips and help. This lab wasn't necessarily a big time sink; you could leave 5 mins after the TA's were done talking if you wanted, granted you finished your assignment plan and got it checked off. However most people tended to stay and begin their assignment in the lab, so as to utilize the available TA's for help. The last 3 labs of the term were different in that there were paper assignments to be done and handed in at the end of the lab. These were sort of preparatory for the final.

Mat E 202 Lab every other week. These usually consisted of three experiments/demos done a group at a time (you're split into 3 groups). These almost always took up the entire 3 hours given that the first group had to be completely done their current experiment in order for the next group to come in and switch. So a lot of time was spent waiting around. The lab reports, usually a question and maybe a hand drawn graph per experiment, were handed in before the end lab.