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There is no grace period after signing a car lease. This assumes that there was no misrepresentation or fraud in the inception of the agreement. Also, dealerships generally display a No Cooling Off Period in the financing office and similar language is customarily on the lease and other documents.
The moment you complete the sale/lease documents and take physical delivery of the car (drive off the lot), there is no cooling off period in which to return the vehicle and rescind the sale. At this point it is yours. The only exceptions to the no cooling off period are dealer fraud, or if the dealer has delivered the vehicle on a subject to lenders credit approval conditional sale, and it later turns out that the dealer cannot secure the necessary financing to complete the sale.