The maximum distance that a LX (Long-Reach) Small Form-Factor Pluggable (SFP) module can reach depends on the specific type of LX module you are using. LX typically refers to a type of SFP module that uses long-wavelength (1310nm) light for transmission.  

The LX SFP module is commonly used in fiber optic networks, and its maximum reach can vary based on the type of fiber optic cable and its specifications. Here are some common LX modules and their maximum reach:

1. LX Single-Mode Fiber (SMF) Module:

• LX modules operating over single-mode fiber can typically reach up to 10 kilometers (about 6.21 miles).

2. LX Multi-Mode Fiber (MMF) Module:

• LX modules operating over multi-mode fiber usually have a shorter reach compared to single-mode modules. They are typically used for shorter distances, up to around 550 meters (about 1804 feet).

It's important to note that these distances are generalizations, and the actual reach can be influenced by factors such as the quality of the fiber optic cable, the presence of any connectors or splices in the cable, and the specific LX module and networking equipment being used.

Always refer to the datasheet and specifications provided by the manufacturer of your LX SFP module for accurate information regarding the maximum reach and compatibility with different types of fiber optic cables.