I think we all will be surprised at how rapidly movement at the very bottom of Atlanta happens. The jr man there now is a 2014 hire. However Delta has hired lots of folks and we have lost a fair number of folks to Delta (especially during the 2015-2016 contract timeframe) so I don't believe there is an equal distribution of guys looking to bid into Atl as there is for other bases. It just doesn't make sense for a guy with less than 3 years who lives in Atlanta to not try for Delta or move to another base. I know guys who have done both.
Best guess for a new hire today, I'd say right around a year, possibly less, and 2 years worst case.