Here is the analysis for United. You’d be looking at about the same time frame to the highest paying seat (764/777/787 CA). You could fly any of those aircraft (with the exception of the 764, it seems to come and go) out of Dulles and avoid the commute. The right seat on those aircraft has gone more junior in the past, but it’s constantly changing. As of now you could hold the 777 or 787 right seat in IAD at around 3 years seniority. It all depends on where you want to end up living long term.
Retirements:
10 years - 5500
15 years - 9000
20 years - 10600 out of 12700 on property