diff --git a/src/main.cpp b/src/main.cpp
index b9e33426..dcfbc9b9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -150,8 +150,9 @@ void verifyWakeupLongPress() {
   // Give the user up to 1000ms to start holding the power button, and must hold for SETTINGS.getPowerButtonDuration()
   const auto start = millis();
   bool abort = false;
-  // It takes us some time to wake up from deep sleep, so we need to subtract that from the duration
-  constexpr uint16_t calibration = 29;
+  // Subtract the current time, millis() starts counting from the moment the device starts.
+  // This way, we remove the time we already took to reach here from the duration.
+  const uint16_t calibration = start;
   const uint16_t calibratedPressDuration =
       (calibration < SETTINGS.getPowerButtonDuration()) ? SETTINGS.getPowerButtonDuration() - calibration : 1;