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Li-Ion batteries on laptops need recalibration every 30cycles just to ensure the OS reads the battery level correctly. (A full cycle is defined as a complete drain from 100%. For Li-Ion battery, partial cycles are acceptable and accumulated to form a complete cycle)
Assuming this is true for Sony Reader and assuming that it is charged weekly (when it drop by one bar or roughly translated 25%) this would require 30 months before the battery requires a calibration. If the usage is 2 bar/week, then it will roughly requires 15months before recalibration.
Even if you miss a calibration cycle, it is no biggie since the inaccuracies is minimal.
Bottom line - just charge it whenever you want.
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