This read-only value reports, in seconds, how long the proxy agent treats a cached value from the RAID7 array as valid before it is considered stale. Once this time is exceeded for an object, further reads of it return GenError instead of the last known value, so admins use this to understand how fresh their polled data actually is. A cache lifetime of 60 tells the admin that any RAID7 value not refreshed within the last minute will start returning errors instead of stale data.