Mont. Code Ann. § 70-7-112

The lender of a thing for use may at any time require its return, even though the lender lent it for a specified time or purpose. However, if on the faith of an agreement the borrower has made arrangements that a return of the thing before the period agreed upon would cause the borrower loss exceeding the benefit derived by the borrower from the loan, the lender shall indemnify the borrower for the loss if the lender compels a return and the borrower has not in any manner violated the borrower's duty.