An Event Block Lifecycle measures the interval between the creation of Event Blocks.
The two types of Event Blocks, Transactions and Envelopes, will carry on throughout a model as long as rows contained inside of the model are passing through the system.
A new Event Block is created each time data from a block is distributed to a new element in the model. If an element is feeding multiple destinations, such as streams, windows, and adapters, a separate transaction is sent to each element. Events can be filtered out of an Event Block without impacting the block.