PMHUB-G Validity period of 35 PDU's/Contact Hours

Dear Experts,

I am preparing for the PMP examination now a days. I had completed my
35 PDU's/Contact Hours through Astrowix in July-2009. I have the
certificate of the same also from Astrowix for completing 35 pdu's.

I am having a doubt/not sure about the validity of this 35 pdu's which
I had earned by attending the instructor let training on PMP. ( on
PMBOK version-4)
Can I apply for the PMP test by submitting this 35 pdu's of July-2009.
Is there any validity period like after acquiring 35 pdu's you have to
appear for the PMP exam.

Please guide me. If this is not valid then is there any alternative
cheap way for getting again 35 contact hours through web learning or
distant learning.

Regards,
Hemant Virkar

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