From the member website:
If a Member chooses the “Deposit First” option, Points will be deposited with Interval and remain there until used by the Member for an exchange or the expiration date for the Points, whichever occurs first. Please note that when using this method, Points will not be returned to the Member’s Disney Vacation Club account. Deposits must be received by Interval at least 45 days—but no more than 24 months—before the expiration date of Points.