bruteforce time for electrum wallet.dat

bruteforce time for electrum wallet.dat

Suppose that an intruder took over my wallet.dat from electrum. The file is encrypted using the standard electrum method. The password consists of small and large characters, as well as special characters.

How many characters are needed in the password so that it cannot be bruteforced in a reasonable time? For example, is there enough 10 characters?

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