The number of transfers that can be done per month depends on the type of account in which the funds are being transferred out of.
There is no limit on checking account transfers.
Transfers or withdrawals from a savings account without a signature are limited to 6 per calendar month. This is a federal regulation called Regulation D. These transactions include telephone transactions, E*Teller and overdraft transfers. Any transfer or withdrawal in excess of 6 must be completed in a branch or at an ATM.
Click here for detailed information regarding Regulation D.