How to change the length of pauses automatically

Hello! I study English and some intervals between phrases in audiocourses are too long and it becomes quite a problem and just a waste of time. Is it possible to “find all silences and reduce their length to 0,5 sec if more” automatically? (Windows XP). Thanks

Try the “Truncate Silence” effect: http://manual.audacityteam.org/man/truncate_silence.html

I have no “trancate to: () seconds” option.
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I couldn’t understand myself because of my poor english I’m sorry.

You appear to be using an obsolete version of Audacity. The current version of Audacity is available here: https://www.audacityteam.org/download/

I’ve downloaded LADSPA plugins and everything’s OK now! I’m much obliged to you!