Time to hold a line at BWI is tuff. They keep putting new hires there which takes away from available lines each month. I was 100 from the bottom and barely got a blank line month after month. I moved bases and lost senority but was able to control my schedule much better since I wasn't at the bottom of blank lines.
Until they stop staffing BWI with newbies then it will be a real long time to hold a line. A year to hold blank.