Is this a trend? In Indistinguishable From Magic, which judging from the stardate and references in other novels has to be in early 2383, Geordi says he has been chief engineer for "Nineteen years on two Enterprises." That's got to be a mistake since he had to have gone from Enterprise-D flight controller to chief engineer around New Year's 2365.
The plot thickens! Geordi, it seems, can't accurately judge the passage of time, and keeps adding additional years in his reminiscing. The problem is also apparently getting worse, as he's moved from adding one year in 2383 to adding five in 2384.
Clearly, Geordi is in the process of becoming
unstuck in time, a floating temporal anomaly who experiences an increasing amount of "subjective" time for each "objective" year that passes. Soon he'll start talking about lengthy adventures that no-one else remembers, and will become increasingly unhinged. This will end with a DTI/TNG crossover that will see Geordi's mind downloaded into an android on Mudd's planet before said android is locked in the vault on Eris for safekeeping.