If maximizing consecutive days off is the goal, just a strategy to anyone while the topic is up: bid a vacation period that touches two months so that there are two separate bid opportunities to get days off before vacation and then a separate one to get days off after vacation.
That's exactly what I did this year. Wound up with something like 25 days off.
Kept the bids for each month really, really simple, requested a long block of days off that touched my vacation on either end and gave Flica free reign otherwise. Worked out great.