Citi does a 7 year background check and it takes 1 month
Background checks are ongoing, lengthy, extensive and tedious and could get several questions on the same issue, a month after I had left the company they were still doing background checks.
CBS checks, carried out within the employment process which is around 6 six from offer to start date
Like any financial institution they will of course conduct background checks as you're dealing with client sensitive information. If you've been in jail for fraud then it's not likely you would be suitable obviously. It takes as long as it takes.