The distance and the duration just refer to reach the "Prebischtor".
The Pravčická brána (German: Prebischtor) is a narrow rock formation located in Bohemian Switzerland in the Czech Republic, approx. 3 km northwest of Hřensko. With a span of 26.5 metres, an inside height of 16 metres, 8 metre maximum width and 3 metre arch, it is the largest natural sandstone arch in Europe, and one of the most striking natural monuments in the Elbe Sandstone Mountains.
Take a picture with you, a note with your oc name or something comperable and add this to your log.