Much as I love and respect you, I’m going to have to disagree. Loans should ALWAYS have a termination date, even if the museum and lender plan on renewing the loan “forever”. I’d even consider a 10 year loan period over a one with no end date. The rationale of being able to “touch base” periodically (every x number of years) can be phrased in such a way as to be beneficial to the lender as well as the museum. Perhaps telling the lender that you want to make sure the piece is insured at the proper level or even that it’s museum policy (the ever useful catchall excuse) to review contracts every 5 years.