Instructor created zyLabs can be restricted such that students can only view the labs within a certain time window.
Note, you may wish to review our article on How to create a zyLab if you do not have any custom zyLabs yet.
To set the time window, enter the zyLab's edit experience by clicking "Edit lab" at the top of the zyLab. Note if you are creating a zyLab you will already be in the edit experience.
Scroll down to "Options" then scroll to "zyLab availability windows".
Select "Use windows" to enable the time pickers. Then select the start and end date/times for when the zyLabs should be available to students.
Here is what students will see
Before the time window
During the time window
After the time window
Students who are working on the zyLab near the end of the time window will receive a warning 30 minutes before the deadline, as well as 15 minutes before and one minute before.
During the last minute, a persistent timer will appear in the bottom corner to let the student know exactly how much time they have left.