@Override
    public long serviceTicketCount() {
        return countTicketsByTicketType(ServiceTicket.class);
    }
Calculate the time at which the ticket is eligible for automated deletion by MongoDb.
Makes the assumption that the CAS server date and the Mongo server date are in sync.
support/cas-server-support-mongo-ticket-registry/src/main/java/org/apereo/cas/ticket/registry/MongoDbTicketRegistry.java