4 years. 55/125/195/280. Any single year is 55. Two consecutive years, 125, three consecutive years, 195. Four consecutive years, 280. I found that single year minimums created a race to the bottom. Consecutive years would allow tankers to yo-yo(55/70/55/70). Three might work but teams could still yo-yo a bit(55/70/70/55) and never really compete. 4 is the bomb and, quite frankly, asking owners to not average 92+ losses over 4 seasons doesn't seem ridiculous.