Out of interest I emailed the big chain Glourious Jeannie coffee company and asked them this question.
"I’ve heard that coffee has a life span of about 3-4 weeks after it has been roasted. Does the coffees that are used at Gloria Jeans Outlets fall within this time period?"
They replied with...
"Good morning Steve
Thank you for writing to us.
Our coffee is roasted and packed immediately here on our premises in Sydney.
Because of this, our 1kg bags have a shelf life of 12 months and our 200g have a shelf life of 18 months.
Our coffee is roasted, packed and flushed with nitrogen to eliminate oxygen and packed in air tight bags.
We trust that this assists you and thank you again for your enquiry."
Have they stumbled upon a technique that no other coffee roaster in the world knows about to be able to keep the beans fresh for 12 - 18 months. Maybe its the nitogen.
I think not. :-/
"I’ve heard that coffee has a life span of about 3-4 weeks after it has been roasted. Does the coffees that are used at Gloria Jeans Outlets fall within this time period?"
They replied with...
"Good morning Steve
Thank you for writing to us.
Our coffee is roasted and packed immediately here on our premises in Sydney.
Because of this, our 1kg bags have a shelf life of 12 months and our 200g have a shelf life of 18 months.
Our coffee is roasted, packed and flushed with nitrogen to eliminate oxygen and packed in air tight bags.
We trust that this assists you and thank you again for your enquiry."
Have they stumbled upon a technique that no other coffee roaster in the world knows about to be able to keep the beans fresh for 12 - 18 months. Maybe its the nitogen.

I think not. :-/
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