During EYW2 I had many wings post incorrectly, many of my badges did not post correctly and it took several months to get resolved. IIRC final resolution did not take place until after the originally posted deadline (which I think was mid-March). So yes, March seems about right.

There are threads on here about people being refused mileage for flights that get diverted, etc. Even though it should straight forward since no other airlines are involved, it isn't. They err on the side of caution and give time to make sure things post correctly to ensure that people get the proper number of wings/miles.