<wsdl:definitions
  targetNamespace="http://www.example.com/wsdl/exmple"
  xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  ...>
   <wsdl:message name="orderDetails">
    <part name="processDuration"
       type="xsd:duration"/>
   </wsdl:message>
</wsdl:definitions>

<process name="orderCar"
  xmlns:def="http://www.example.com/wsdl/example" ...>
  ...
  <eventHandlers>
    <onAlarm 
      <for>$orderDetails.processDuration</for>
    </onAlarm>
  </eventHandlers>
  ...
  <variable name="orderDetails" 
      messageType="def:orderDetails"/>
  </variable>
  ...
  <receive name="getOrder"
    partnerLink="buyer"
    operation="order"
    variable="orderDetails"
    createInstance="yes"/>
  ...
</process>

Click on the Event Handlers tab of the Process Editor.
Drag a
Timer catch event
to the Event Handler canvas.
In the Properties view, optionally select the Dialog button at the end of the
Repeat Every
row. Type in or compose an expression for the interval. Use this attribute alone or in conjunction with a Wait Type.
Set the
Wait Type
as one of the following:
Select
Deadline Expression
to type in or compose an expression representing the deadline (wait until) for the alarm.
Duration Expression
to type in or compose an expression representing the duration (wait for) for the alarm.
Duration
to select the number of days, hours, minutes, or seconds to wait.
T time in X days to set a deadline that is X days plus T hours. The expression resolves to an expression such as:
x
sd:dateTime(current-date()) + xsd:dayTimeDuration("P3DT15H20S")
Drag an activity into the event handler to respond to the event, such as a reply or exit.
Fill in the properties for the activity that handles the event.

Display a BPEL file in the Process Editor, and select a scope.
Drag a
Timer catch event
to the scope.
In the Properties view, fill in properties as described above for the process.
Drag an activity into the event handler to respond to the event, such as a reply or terminate.
Fill in the properties for the activity that handles the event.