public long getTTLExpirationTime() throws EntryNotFoundException {
    long ttl = getTTLAttributes().getTimeout();
    long tilt = 0;
    if (ttl > 0) {
      ttl = normalizeToMillis(ttl);
      tilt = getLastModifiedTime() + ttl;
    }
    return tilt;
  }
Return the absolute time when TTL expiration occurs, or 0 if not used
geode-core/src/main/java/org/apache/geode/internal/cache/ExpiryTask.java