Answer
Yes, an account statement may be needed for a long period. In one scenario, a statement showing income for at least six months is required; another mentions a full bank statement covering 3–5 years to confirm how the funds were accumulated.
The difference is related to the task: the bank or other participant in the procedure can look at either regular income or the history of capital formation. One current account balance is often not enough because it does not show where the money came from.
It is better to collect account statements in a readable form in advance and prepare an explanation for large incoming payments. If money has been accumulating for a long time, a long history helps link income, savings, and the current amount into one clear chain, without gaps between periods.