How to track the time and print to the monitor

Projects Programming
1

I have commands that use the DELAY function, i want to verify if they work.
How to track the time from a DELAY start function, or other event

2

You can use millis() function to save time before and after delay, and then calculate the difference

3

if that was not clear enough, what @IoT_hobbyist is suggesting is

unsigned long startTime = millis();
// ... some code
Serial.println(millis() - startTime); // nb of milliseconds spent in "some code"
4

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