For roughly 1 one year.
Maybe longer depending on the course.
Does it ever expire?
I just want to know as I'm leaving the country for a few months and don't want to have to do it iagain.
As long as the monitoring agency is still valid and reports it to the DMV, you will be fine.
What happens if I have to switch courses?
If you already have a valid license, you don't have to worry about them.
Do I need supervised road training before I take my test?
If under the age of 18, yes; 50 hours.
Who can I do that with?