Do merc/season passes begin soon as bought?

I'd like to try to get the cat ears crate from the pass but I'll be stuck working the next 2 weeks and won't be able to work on the daily / monthly tasks. So my question is if I buy the pass does it start it's countdown immediately (30 days?) Or could I start it when I'm on days off? I'm hoping it will still be available for purchase by the time I can get back to CF.

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