I wouldn't do it two months out unless you aren't worried about money/pay. Most folks will get about one months notice (give or take a few days) of their class date. I also wouldn't give less than is customary; that may come back to bite you down the road.

As an anecdotal data point, I was told 21 July or 4 August. I missed both of those and the 11 August class as well. On 17 July, I was called and asked if I wanted a fallout slot in the 11 August class and I said yes since I was currently not working. A few hours later, I was called back and offered a slot for 4 August due to another fallout. Just lucky timing I think to be working with the scheduler when it happened.

One last data point. DAL recently sent out a letter informing CJO folks on a big slowdown in training and that many would have to wait until potentially January 2016 or later to class up. It was due to sim changes and upgrades at their training facilities. It made me think of UAL and their impending TK changes.

I would at least wait until being assigned a class date. No guarantees, but it's better than betting on the come and getting pushed past the anticipated date. With the current hiring push across the board, folks are getting multiple offers and I think that drives some of the volatility in scheduling classes.