While Schema.org writes
Here is an example:
Don’t use the time element.
It’s an error with Schema.org’s documentation. I reported this issue in the Schema.org tracker and it will likely be fixed in the next release.
Possible alternatives:
data element:
Tuesdays and Thursdays 4-8pm
meta element (which can be used in the body):
Tuesdays and Thursdays 4-8pm