ssl/server_cache_lifetime is a SAP Parameter attribute which is used to control Lifetime of the server side SSL session cache entries information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter lets you define how long an SSL server can
be held in the cache.
For more information about the SSL Server Cache, see the description
of profile parameter "ssl/server_cache_size".
See SAP Parameter Documentation for full SAP documentation for this profile parameter.