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.
Release Date
U.S. Citizenship and Immigration Services today released policy guidance on the eligibility criteria for initial and renewal applications for employment authorization documents (EADs) in compelling circumstances based on existing regulatory requirements at 8 CFR 204.5(p).
For an applicant to be eligible for an initial EAD based on compelling circumstances, they must meet the following eligibility requirements: