public static int durationIndexBucket(long ts_micro) {
    // if the window constant has microsecond precision, the division produces negative getValues
    return (int) (ts_micro / (DURATION_INDEX_BUCKET_WINDOW_SECONDS * 1_000_000));
  }
Time window covered by a single bucket of the {@link Schema#TABLE_TRACE_BY_SERVICE_SPAN} and
{@link Schema#TABLE_TRACE_BY_SERVICE_REMOTE_SERVICE}, in seconds. Default: 1 day
zipkin-storage/cassandra/src/main/java/zipkin2/storage/cassandra/CassandraUtil.java