code: void expireAfterAccess(String key, @Nullable String value) {
      requireArgument(expireAfterAccessDuration == UNSET_INT, "expireAfterAccess was already set");
      expireAfterAccessDuration = parseDuration(key, value);
      expireAfterAccessTimeUnit = parseTimeUnit(key, value);
    }
docs: Configures expire after access.