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