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Voltage Reference warmup and long term drift

I am designing a 12V battery powered data logger that will be sampling every 15 minutes.  I am currently using the LTC2408 ADC with the ADR4550 reference.  I am removing power from the ADC and the voltage reference in between samples to save power.  I have a few questions.

1) How will constant power cycling effect the voltage reference? 

2) How long should the voltage reference be powered on to stabilize?

3) Will only powering the voltage reference for 10 seconds every 15 minutes reduce the long term drift?  Normally 1000 hours is 42 days, but in my scenario it would take 10.3 years for the voltage reference to be on for 1000 hours.  Would this improve the long term drift or would powering the voltage reference on and off cause other issues?