Can you put a deadline clause in a contract

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Can you use a contract deadline date as an exit strategy? 

Like a 2 week clause where if you still can't find a buyer by then the contract can be terminated and the seller can get their property back free and clear. 

Is that a thing? 

Sounds like a very good marketing strategy as well. You can give the owners some initiative by saying "Your house sold in two weeks or get 100 dollars"