How long did it take Albert Einstein to create E mc2?

Related questions

1. Has E mc2 been proven?
2. What does Einstein's equations of general relativity relate to?
3. Why is E mc2 so important?
4. What does E mc2 have to do with stars?
5. Was Einstein a capitalist?
6. Who invented the nuke?
7. Why did Albert Einstein win the Nobel Prize?
8. Why was Hiroshima chosen as the site for the atomic bombing?
9. What is the theory of E mc2?
10. What is the formula of Einstein?

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