My CRSC (Army) Timeline:
11/20/17- CRSC received packet
8/20/18 - Recieved CRSC approval letter
10/1/18 - Recieved 1st payment from DFAS
2/20/19 - Recieved retroactive pay
FYI - Per DFAS, my retro took a while due to the amount and large amounts may or may not be deposited on the date on CRSC...