The only limitations are:
- Only two stopovers in the continent of origin (your itinerary as posted fails this - it has 3).
- You may pass through your city of origin, but you cannot make any more international trips after returning there (hence this is only useful in countries with domestic OW flights).
- Maximum 20 flight segments in total and 4 in each continent except N America which allows 6.
- Otherwise no restrictions.