Language Lab

If a foreign language class requires 2 hours in the language lab what exactly does that mean? There are no “lab” class scheduled, Do you just go to the language lab when you have time? Does the professor have required things you need to do at the lab? Just trying to figure out what is done at the language lab and how difficult it is to schedule or if you just drop in. Thanks!

Most language labs are drop in and you will have specific assignments from your prof.