14 months here. First six months hardly flew at all. I'm a commuter so I bid PM RSV starts in hopes that I would also be able to bug out at 5pm on last day (ask me how that worked out!). It was suggested I bid AM which meant coming in night before but that didn't help.
In six months I got a line and picked up/traded for better block to garner 100-106 hrs credit to refill the war chest. I did 8.5 hrs holiday pay on Thanksgiving and 9.5 on New Years (double dip west coast red eye on NYE). This month I scaled back: 18 days off with 80 hrs credit (including two Saturday's and a full weekend off). The PBS adage that it benefits the upper and lower 20% seems to be true in my case! I'm the lower.