@Override
    public ZonedDateTime toMaximumExpirationTime(final Ticket ticketState) {
        return ZonedDateTime.now(Clock.systemUTC()).plusYears(MAX_EXPIRATION_IN_YEARS);
    }
The time to kill in seconds.
core/cas-server-core-tickets-api/src/main/java/org/apereo/cas/ticket/expiration/TimeoutExpirationPolicy.java