What do you mean by extension of time? Is time of the essence? What impact would not delivering the contract on time have? How does the contract protect against not being delivered on time? Is there a link to any other clauses (eg liquidated damage / force majeure / change control)? What remedies (if any) are available if the contract is not delivered on time? Are there any 'gaps' in the contract? Is there a link to any statutory implied terms?