Activiti / Camunda change boundary timer with variable

Question

I got a special question regarding timer boundary events on a user task in Activiti/Camunda:

When starting the process I set the timer duration with a process variab

Answer 1

If the timer is running you can change dueDate of the timer by executing a signal. If a assginee requested more time, set new value of hurry and execute the signal. The old timer will be canceled and the new timer will be created with new due date.

runtimeService.setVariable(execution.getId(), "hurry", newDueDate);
runtimeService.signalEventReceived(signalName, execution.getId());