Mean time (in milliseconds) spent in message delivery
callbacks associated with LBM receivers, wildcard receivers, hot-failover
receivers. This is an exponentially weighted moving average (weighted
to more recent). For the Java and .NET APIs, the overhead time spent
in crossing the managed/jni boundaries is included. This stat is only
collected if the context option receiver_callback_service_time_enabled
is set to 1. SMX receivers are excluded from these stats. THIS FIELD IS
UNSUPPORTED.

C# |
public long receiveCallbackServiceTimeMean()

Mean message delivery service time. THIS FIELD IS UNSUPPORTED.