The feedback was comprehensive with both a summary sheet that had various categories of feedback (general comments, content, discussion and analysis, justification for mark, referencing/bibliography/presentation, points for further consideration) and a commented/marked up version of my assignment in word format. from Cambridge by the way and was not a teaching assistant.
The comments were useful and I followed up with the course coordinator to clarify a couple of them and he was very responsive. The second assignment was an essay of 3,000 words intended to illustrate substantial learning from the course.
Normally, I email and receive a reply within 24-48 hours.
There are no online discussions required, so you don't need to worry about the time difference there, although there is an online discussion forum available. The best way to view this is that it is a guided self-study program, more or less an individual study with tutor support.
Finally, there is a Blackboard site for the course to enable interaction with other students and tutors.
I have been able to log onto Blackboard successfully, but it seems the University staff forgot to associate the course with my account so that part is not yet available for access.
The ability to take the course while working full-time is very convenient.
I will post a couple more times about the course, including my experiences with the written assignments and grading.
So far all my tutors have been full-time faculty holding Ph. Their feedback on assignments has been detailed and helpful.
I have not noticed any issues with the time difference.