OK - yes - this is a Mars Odyssey story
This could have quite an impact on MER operations - there will be less time to do a days driving before having to stop for the MODY UHF relay pass on average. I wonder if this has been considered?
If the power situation is good on Opportunity - it is the time between uplink and downlink that is the limiting factor on driving, given CPU intensive stuff to do the advanced roving techniques.
I wonder if they can transition to MRO, which is typically an hour later, or even more MEX relays.