We know that there is a limit to the duration of a threshold violation - 180 min (3h) in place on TrueSight. There are situations where he would like to increase duration over 180 min, but we cannot exceed this value. is there a way to change the duration value?
It is not possible to make a threshold duration longer than 180 minutes. We do not encourage using a longer duration, the intent of the product is to alert you to issues which need attention and changing the duration delays the attention to the issue at hand.
So it is recommended that you review your processes and why you want to change the duration of the threshold, perhaps there is something in the process which needs changing? Also the recommendation is to not rely on absolute thresholds, but perhaps use signature thresholds.
The setting will not be made to be configurable at this point as that is the way it was designed, so if you have additional questions or concerns BMC would recommend reviewing the signature thresholds as an alternative.