x-duration field always 0 in access logs

Hi,

On monitoring the x-duration field of the access logs I find the value 0 for both client-pause and client-unpause events. These two are stream level events. According to the definition for x-duration atleast any one of these two fileds should have non-zero value.

x-duration

Duration of a stream or session event. For a stream, this value is the number of seconds the stream has played. For a session, this value is the number of seconds the client has been connected.

Is my interpretation wrong ? Or there is something wrong with the logging mechanism of our AMS. Kindly give your comments.

Thanks in advance.

Veera