h-1 stamping from canada .. how much max time it takes.

[junaid_khan18]

hi all,

I am f-1 to h-1b case in usa. I have expired f-1 visa on my passport. I have been on h-1b from 4 years through same company.
Recently, I got my canadian immigration and like to get my h-1b visa stamped from canada.

I like to know, how much max. time ever taken to someone to get his h-1b stamped or any rejected h1-b cases.