<timespanbeforedive> indicates the time span in seconds as a real number, when a drug was taken, or the diver had a drink before starting the dive.
The conversion of seconds into other units is up to the application software.
<alcoholbeforedive>, <drink>, <medicationbeforedive>, <medicine>, <periodicallytaken>
(see also <medicine>)
<!-- 3 1/2 hours before starting the dive a drink or a drug was taken -->
<timespanbeforedive>12600.0</timespanbeforedive>