diff --git a/Marlin/src/MarlinCore.cpp b/Marlin/src/MarlinCore.cpp
index 272e50340a..b3c8d5d9d0 100644
--- a/Marlin/src/MarlinCore.cpp
+++ b/Marlin/src/MarlinCore.cpp
@@ -474,11 +474,17 @@ inline void manage_inactivity(const bool no_stepper_sleep=false) {
 
   #if HAS_KILL
 
-    // Check if the kill button was pressed and wait just in case it was an accidental
-    // key kill key press
+    // Check if the kill button was pressed and wait to ensure the signal is not noise
+    // typically caused by poor insulation and grounding on LCD cables.
+    // Lower numbers here will increase response time and therefore safety rating.
+    // It is recommended to set this as low as possibe without false triggers.
     // -------------------------------------------------------------------------------
+    #ifndef KILL_DELAY
+      #define KILL_DELAY 250
+    #endif
+
     static int killCount = 0;   // make the inactivity button a bit less responsive
-    const int KILL_DELAY = 750;
+    const int killDelay = KILL_DELAY;
     if (kill_state())
       killCount++;
     else if (killCount > 0)
@@ -487,7 +493,7 @@ inline void manage_inactivity(const bool no_stepper_sleep=false) {
     // Exceeded threshold and we can confirm that it was not accidental
     // KILL the machine
     // ----------------------------------------------------------------
-    if (killCount >= KILL_DELAY) {
+    if (killCount >= killDelay) {
       SERIAL_ERROR_START();
       SERIAL_ECHOPGM(STR_KILL_PRE);
       SERIAL_ECHOLNPGM(STR_KILL_BUTTON);