Sorry, let me give you the complete sequence.
1. H4 to H1 approved effective Oct 1st, 2007
2. Company paid starting from March 1st, 2008.
3. W2 available for 2008 which is 2 months lesser than LCA wage. Do not have the pay stubs for 2008 as we did not save them.
4. Worked until March 2009 and converted to H4 effective April 1st 2009. W2 and pay stubs available for 2009.
Now the entire duration of out of status is 150 days. However, since we don't have the pay stubs for 2008 and W2 does not clearly tell whether it was 2 months without pay or underpaid for the entire year.