How to stop recursive single shot timer after 240 second ?

Qt embedded developer

Below you can see that my startcalibration function is call MagnetometerCalibration function

how to stop this recursive call after 240 second ?

void startcalibration()
{
QTimer::singleShot(1,this, SLOT(MagnetometerCalibration()));
}

bool MagnetometerCalibration()
{
QTimer::singleShot(1,this, SLOT(MagnetometerCalibration()));
}

J.Hilk

@Qt-embedded-developer
use a QElapsedTimer as member variable,

in startCalibration, start it,
in MagnetometerCalibration check if the elapsed time is below 250 ms