A fixed date looks simple, but it rarely matches a property settlement. Between signing and registration, documents must be collected, encumbrances discharged, taxes handled and bank releases coordinated. If one step is delayed, a rigid due date creates pressure without improving security.
A better clause ties maturity to objective conditions. These include a valid contract, secured priority ranking, an escrow mandate, resolved discharge of encumbrances and tax handling.
The clause should also say who confirms fulfilment of the conditions. In practice this is often the escrow agent, because they coordinate payment, documents and land register steps.