[rubidium]

It stays good for a month if properly stored, then starts down. Always grind right before brewing.

The first 3-7 days after roasting its not typically at its best yet.

[havernator]

I don't notice much difference on the mid-grade beans until a week out, but the expensive top-end stuff is going downhill on day 4, maybe day 5. It's not ruined yet, but if you paid 50-100% more than for mid-grade beans, it's not ideal.