public long timeElapsed(TimeUnit unit) {
        return unit.convert(container().currentTimeMillis() - creationTime, TimeUnit.MILLISECONDS);
    }
<p>Returns the time that this Request has existed so far.

@param unit The unit to return the time in.
@return The number of time units elapsed since this Request was created.
jdisc_core/src/main/java/com/yahoo/jdisc/Request.java