Does tomcat ever close a connection once it is in the 'Service' mode?

Using the manager app (/manager/status) I am seeing multiple threads in
the 'Service' mode with times of well over 60 minutes! Here is an
example:

Stage  Time  B Sent  B Recv  Client  VHost  Request
S  5192947 ms  0 KB  0 KB  67.152.68.16  dev1.mycompany.com  GET / HTTP/1.1

I know that these connections came in during a period of particularly
heavy load and the server couldn't respond to them right away. No
response was ever sent back to the browser but the threads stay open
and eat up a resource until the app server has to be restarted.

Is there any setting that will cause such orphaned connections to be
terminated and returned to the pool?

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