setLowPowerShutdownTime() usage

  • I am having trouble using this function. Example code below.

    #include <M5ez.h>
    #include <M5Stack.h>

    void setup() {

    void loop() {
    ez.msgBox("M5ez minimal program", "Hello World !", "Settings");;

    When I compile I get the error "exit status 1 'ShutdownTime' has not been declared"

    What am I doing wrong?

    What I am trying to do is to have the M5Stack Gray stay on for a short time after the USB is unplugged. At the moment when the USB is unplugged the M5 resets and then restarts.