e90e091b_Apache_Kafka__Description
[Property] log.retention.{ms,minutes,hours} [Default] 7 days [Description] 
The amount of time to keep a log segment before it is deleted, i.e. the default data retention window for all topics. Note that if both log.retention.minutes and log.retention.bytes are both set we delete a segment when either limit is exceeded. This setting can be overridden on a per-topic basis (see the per-topic configuration section).
Apache Kafka
Description