getKeepAliveTime
Returns the thread keep-alive time, which is the amount of time that threads may remain idle before being terminated. Threads that wait this amount of time without processing a task will be terminated if there are more than the core number of threads currently in the pool, or if this pool .allowsCoreThreadTimeOut.
Return
the time limit
Parameters
unit
the desired time unit of the result
See also
.setKeepAliveTime