Unfortunately, you cannot change the term of your Vault once is has been opened.
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Once you have deposited your chosen amount into the Vault and the first 10 days have passed, your Vault will then be locked in and cannot be changed until it has matured.

This is to ensure stability and accurate predictability for your financial planning.

But don't forget that you can open as many Vaults as you wish, giving you the flexibility you require.