Find the configuration files for your installed version (use the Files button in the control panel)
# Athlete timer milestone values in milliseconds.
# Copy this file to the local/ directory (or the directory set by OWLCMS_LOCALDIR)
# under timing/timing.properties to override the defaults.
# Environment variables OWLCMS_ATHLETE_TIMER_ONE_MINUTE and
# OWLCMS_ATHLETE_TIMER_TWO_MINUTES override the corresponding file values.
athleteTimerTwoMinutes=120000
athleteTimerInitialWarning=90000
athleteTimerOneMinute=60000
athleteTimerFinalWarning=30000