There is no maximum amount you can invest into your Blockchain Vault, but there is a technical limit of 20 000 EUR or the equivalent of 20 000 EUR in USDT by transaction. If you want to invest more than 20 000 EUR, you will have to do it in several deposits.
Please note that deposits in the Blockchain Vault are locked for 24 months. All deposits made within a month will be released on the first day of the following month, 2 years later. For example, if you make multiple deposits into your Vault in December 2023, the funds deposited successively will be released at the same time on January 1, 2026.
Please find below an short video explaining how to do it :