Calculate the outbound queue size.
OutboundQueueSize = OutboundQueueVolume * (FailureDuration + SaveInterval)
OutboundQueueSize = 18K/sec * (60min + 60min) = 0.018MB/sec * 120min * 60sec/min = 130MB
In practice, if the actual change rates and table selectivities result in less than a full 16K block being filled each second, then the figures obtain by these calculations are low. Replication Server writes a block every second, whether or not the block is full. The worst usage of queue space occurs when small transactions are executed more than a second apart. Statistics indicate that most blocks are from 50 percent to 95 percent full.