optional, single

—

The element indicates the total length of the height exposure (the flight) in seconds as a real number.

<exposuretoaltitude>

—

<altitudeofexposure>, <dateofflight>, <surfaceintervalbeforealtitudeexposure>, <transportation>, <wayaltitude>

(see also <exposuretoaltitude> and <dive>)

<!-- flight period 1 h 35 min -->
<totallengthofexposure>5700.0</totallengthofexposure>