Hi leaf-xue!
Here is the process with embedded timers. The inner timer fires every 1 second. The boundary timer fires after 5 seconds and end the process.
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-758317-19430/450-264/TimerProcess.png
<process processType="Private" isExecutable="true" id="TimerProcess" name="TimerProcess" tns:packageName="defaultPackage" tns:version="1" >
<sequenceFlow id="_1-_2" sourceRef="_1" targetRef="_2" />
<sequenceFlow id="_5-_3" sourceRef="_5" targetRef="_3" />
<sequenceFlow id="_3-_4" sourceRef="_3" targetRef="_4" />
</process>