Guitar strings should be changed when their tone and feel are no longer acceptable. The speed at which they operate depends on various factors, including playing strength, sweat, humidity, dust, and string material.
Nickel-plated round wound electric guitar strings are commonly used due to their bright tone and high tension, which will decrease. For my guitar, I chose
online guitar parts following the recommendations. The former is critical to the sound, while the latter is critical to proper pitch tuning.
Some guitarists change strings daily, and some may change strings for several months, it's a matter of preference, but also a matter of acceptable quality and string durability.