This month I am studying “Creating logos and icons for mobile apps”
It looks like the course primarily relies on Adobe Illustrator for most of the work, with a few outline sketches.
The course is about 12 hours long, and there are several lengthy exercises to work through, so I am anticipating this will take me at least a month to work through, complete the exercises and then review what I have learnt.
Update: I studied and practiced for 26 hours total.