7 donations?

A few weeks ago, the people that run the blood donor room at work held a little party to celebrate and thank people that donated blood over the past year. I got a small award for having 6 donations, which I thought was the most anyone could donate in a year.
So, much to my surprise, they were also honouring a small group who managed to squeeze in a 7th donation. Kudos to them, but I’m still trying to figure out how they got in a 7th donation. Donating every 8 weeks, the math says that 6 is as many as you can squeeze into a calendar year. Maybe their ‘year’ is longer than everyone elses…
Anyway, go donate blood and help someone out after you finish reading this.