User Defined Activity "hangs" Process Flow if it runs for more than 10mins

I have been using OWB (10g r2) for a while and have used "User Defined" activities in production process flows successfully before.
However my problem now is that the activity (shell command) I want to perform, takes more than 10 minutes to complete. If I run the process flow with a parameter that generates a shell command that executes in two or three minutes, the process flow continues past the sucessfully executed user defined activity to the next activity.
BUT
If I run the same process flow (without modification or even redeployment) with a different parameter , the user defined acivity sucessfully executes (after about 11 minutes or so) but the process flow , doesnt seem to know that it is finished and just says it is still executing.
my "user defined" activity has
COMMAND: /usr/bin/ksh
PARAMETER_LIST bound to a variable which is set earlier in the process flow.
RESULT_CODE:
SCRIPT :
SUCESS_THRESHOLD : 0
by examining (RUNTIME CONTROL CENTER SCHEMA).all_rt_audit_execution_params
I can see that the variable contents assigned to RESULT_CODE look like this
'/usr/bin/rsh -n WINSRV1 dtsrun /usa /ppw /S WINSQLSRV /N JOBNAME_SHORT'
or this
'/usr/bin/rsh -n WINSRV1 dtsrun /usa /ppw /S WINSQLSRV /N JOBNAME_LONG'
I put the -n in because I thought that may have been the problem, but I think its more likely that there is come sort of ".properties" in a runtime file that needs to be set to control the "timeout" of user defined activities.
(like in Runtime.properties
property.RuntimePlatform.0.NativeExecution.Shell.security_constraint = NATIVE_JAVA
except maybe
.........Nativeexecution.timeout = .....?????
Has anybody had a problem like this? Found a document describing available configuration properties for PF activites?
Can anyone help?

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User Defined Activity "hangs" Process Flow if it runs for more than 10mins

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