Millis() as delay() - Monitor serial

[Adanoter]

I try see in serial monitor the time with timestamp and is really wrong
For example

 Smartdelay = millis ();
 while (millis () <Smartdelay + 5000) {}

Takes 32 seconds to change.

[ubidefeo]

@Adanoter
please be more informative with your issue report.
Post your entire sketch code and we'll test it.

I have no idea where you print to Serial and what else happens in the meantime

thank you