There are two main types of Bridging Loan, an Open Bridge and a Closed Bridge.
An Open Bridge has no defined end date to repay the Loan but Loan terms for this type of Bridge usually last 18 months before repayment is expected by the lender. These tend to be more flexible and as a result can cost more than a closed Bridge facility. A closed Bridge has a defined end date in the terms you agreed, and the lender would expect to be in receipt of funds on or before the date specified in order to pay back the loan in full. Terms for this type of Bridge are usually up to 12 months or less.