Does anyone know if course invites expire with a certain amount of days?
I do not believe so, however, if a student does not accept the invitation you can resend it so that it appears when they log into Canvas. Here is a guide that will help:
How do I resend student invitations to a course?
Jesse
Were you able to find an answer to your question? I am going to go ahead and mark this question as answered because there hasn't been any more activity in a while so I assume that you have the information that you need. If you still have a question about this or if you have information that you would like to share with the community, by all means, please do come back and leave a comment. Also, if this question has been answered by one of the previous replies, please feel free to mark that answer as correct.
Robbie