StuckThreadMaxTime Question

We have a process that is cpu and memory intensive.  It is expected to take some
time.  I have some questions about how weblogic behaves in this situation.  

1. What is the behavior of weblogic on threads that take longer than the
configured amount of time?  Does it put them on lower priority?  Does it
eventually kill the thread, or just wait until the thread ends processing.  In
our case, we want it to finish processing (And that is indeed what it appears to
be doing).

2. We do not think it is a good idea to bump up the StuckThreadMaxTime on ALL
threads.  Do you have any recommendations on how to tune this one process?

Some notes on our design:
- Running WLS 9.21
- Running in a clustered envrionment with 2 wls servers
- The process in question is kicked off via JMS and a MDB.

Thanks.