Hi. I'm a contractor working for the FAA.
ALL controllers are having their hours reduced by 10%. This comes out to 1 day per 2 week pay period, or the approximately two days per month in the summary. It's not 10% of controllers being affected, it's all controllers being affected by 10%.
And for those of you saying "Why didn't they cut other, less important budgets?"
Well, it doesn't work that way. Every account was cut 10% across the entire FAA. This is incredibly stupid, by the way, since the much of the FAA's labor is paid for via levies on airline tickets, and so it shouldn't be affected by these general fund shenanigans (as an aside, this is why we got furloughed two years ago, because Congress wouldn't renew the airline ticket levies for political reasons). But, hey, Congress... You get what you pay for.