They look anywhere between 3-6 months, it depends on what type of accounts you have and the statements the bank provides (i.e. certain savings accounts from TD only allow a 3 month statement, so if u don't have one that just closed when applying you'll need to show them the latest one and then provide your checking account statements for those months as well if u ever moved any money between the accounts).
Important question, if anyone has dealt with any lenders while having large sum of transactions in your accounts which you are using to use as a proof of finance. 1) How did you provide written proof of how the money was received? 2) Was there any kickback from the lender? 3) Anything not to say?