Right now, FO reserve times range from 3 months (CMH) to 1 year (PHL). These are based off of DOH, so it's closer to 1 month/10 months if you pull training out.

However, these times can fluctuate dramatically based on hiring patterns, base awards, and route selections, so don't base your plans off of what you see here. YMMV, caveat emptor, etc. etc.