I was working in US on E-3 visa before H1B. Which means I entered USA earlier. When does my 6 years clock starts?
In that case, your 6-year clock begins to run on the date you converted (changed status) to H-1.
Currently, the LCR displays all certified H-1B1 and E-3 Labor Condition Applications (LCA) and Permanent labor certifications, dating back to April 15, 2009. However, the Department is experiencing technical difficulties with the display of approved H-1B LCAs. In addition, due to the historical paper-based filings of H-2A and H-2B applications, these labor certification documents must be manually redacted and uploaded to the LCR and, therefore, only a limited number of records covering Fiscal Year 2013 are currently available.