Ability to edit deal and product length for multi-year deals

We track deals with products in Hubspot and have noticed there is no way to set products to extend longer than three years. When we have deals signed for four years or longer, there is no way to set up the deal and its products appropriately in HubSpot. We would like to be able to edit the length of the contract so that it can extend for as many years as the deal we've made. That would make it much easier for us to track deals, renewals, and invoicing. 

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