RobG
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To get a feel for the probelm, try the lower frequency at 1/(1 month)=380nHz. Then 1/(1 year)=32nHz; then 1/(10 years)=3nHz. What you will find is a relatively slow increase in the total noise. Since this amp buffers the signal, I think you need to look at as long a period as you are going to operate it. That is, if you expect the same A/D output ten years from now for the same input, you need to look at 1/10 years.
If you are close to the spec edge, then I'd be worried about other effects. For example, packaging stress changes over time and can cause more shift. And changes in temperature "look" like noise. These things can be larger than the 1/f component.
rg
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