psulaw0929
OCS Class 04-16, 27 SEP 2015
Generally the boards are relatively quick (couple of weeks), but sometimes it can take up to 2 months (see Sept. 2014 IDC board). As far as how soon after will you go to OCS....only the gods know lol. Unless you are a special circumstance (for example, age critical) there is really no telling how long you will have to wait.
Ah yes, good old Sept. 2014 IDC board. Ended up being something like a 156-page thread. Wasn't sure they would ever release results. To follow up on what @LadyT said, I have seen people in Final Select Purgatory get their FINSEL letters very quickly (like a couple of weeks to a month - mostly, SNA and SNFO) and I have seen people wait almost two years (one particular SWO).