public static void formatDuration(long duration, PrintWriter pw, int fieldLen) {
        synchronized (sFormatSync) {
            int len = formatDurationLocked(duration, fieldLen);
            pw.print(new String(sFormatStr, 0, len));
        }
    }
@hide Just for debugging; not internationalized.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/util/TimeUtils.java