I am not a teacher
I am not a teacher, but i am using Duolingo to teach english to my sister. May i use the teachers functions to see if she is doing the lessons all day?
If your sister agrees, yes.
However, there is a much easier and more reliable way to check anyone's progress.
Our personal statistics in third party website Duome:
You will find explanations and background information in the links on the bottom of the webpage.
The most important are: