30 per hour is 720 per day.
Each day 370.000 babies are born and each day 150.000 persons die, a net increase each day of 220.000.
Each day that Armageddon is delayed, an additional 219.280 persons will have to be killed, assuming JWs only make it.
The ANNUAL increase in numbers of JWs is not much more that the DAILY increase of people on this planet.
Further this figure is inflated, as it doesn't take all the leavers into account.