What are the standard minimum and maximum lengths of username, password and email?

Question

What are the standard minimum and maximum lengths of username, password and email?

Answer 1

A little late to the party, but here is my answer: Maximum User Field Lengths Query for StackOverflow

And the query results below for posterity:

Max DisplayName    Max Password Max Email Length                                      
Length Used On SO  Length
------------------ ------------ ---------------------------------------------------- 
36                 As long as   254 (See: https://stackoverflow.com/a/574698/1945631)
                   possible
(1 row(s) affected)

And, from the above query results, the maximum email length answer as a link