With <setdcdivetimealarm> the dive time in minutes is set when the dive computer shall give an alarm signal (independent of (maximum) dive depth reached). As many <setdcdivetimealarm> elements as needed can appear one after the other to support different alarm signals at different dive times reached.
(see also <setdcdata>)
<!-- reaching a dive duration of 45 minutes the dive computer shall give an acoustic signal -->
<setdcdivetimealarm>
<timespan>2700.0</timespan>
<dcalarm>
<!-- alarm to be given for 10 seconds -->
<period>10.0</period>
<alarmtype>3</alarmtype>
</dcalarm>
</setdcdivetimealarm>
<!-- after 60 minutes of diving the dive computer shall give another acoustic signal -->
<setdcdivetimealarm>
<timespan>3600.0</timespan>
<dcalarm>
<!-- this alarm is to be acknowledged -->
<acknowledge/>
<alarmtype>4</alarmtype>
</dcalarm>
</setdcdivetimealarm>