public Builder clearDuration() {
        bitField0_ = (bitField0_ & ~0x00000020);
        duration_ = 0L;
        onChanged();
        return this;
      }
<pre>
time in miliseconds
</pre>

<code>int64 duration = 6;</code>
@return This builder for chaining.
benchmark/src/main/java/com/alibaba/fastjson2/benchmark/protobuf/MediaContentHolder.java