Hmm, difficult to say as I have no cycling computer anymore on my Strida.
I guess the freewheel lasted about 1000…1200km maximum (2.5 years). It is still the original one but it was causing me problems right from the beginning: high drag and bad working ratchet mechanism, especially after having ridden in the rain. 
See also these topics: [url]My Strida doesn't like cold weather] and [url]Assembly problem?]