Adding Delay to the sub nodes in the mapping

Hi

I have a scenario where I need to execute some nodes in sequence.

<MT_xyz>

-<Header1>

-<Header2>

-<Header3>

</MT_xyz>

I want the Header1 to get executed first and Header2 with a delay of 30sec.

In the other blogs and discussions I could only see the code(UDF to add thread.sleep) which delays the whole mapping execution by specified time, but I need it for sub nodal level as explained above.

Please help in this regard!

Thanks
Sowmya