How to: setting transcode duration

[EdoM]

I'm trying to transcode a stream in a .ogg
i'm iterested in transcode just 1 hour of the stream, so how can i tell to vlc to stop after 1800 secs?

my command is

vlc -vvv _MY_STREAM_ --sout '#transcode{ab=128,aenc=vorbis,channels=2}:standard{access=file,mux=ogg,dst="prova.ogg"}'

in the wiki i found a --stop-time seconds option but it seams it's not working in linux..

Edo