Different spec sheets say different things. Their max range is generally 70km but can do up to 100km provided dispersion shifted or low-attenuation SMF is used. Distance is also depends on the quality of the fiber, the number of splices and connectors.
Here is a link:
http://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/installation/note/78_15160.html