If you asked yourself this question, it is already an indication that your password may not be secure, good practices recommend that your password contain letters, numbers and special characters, as well as by default we generate passwords here on the site, being in this format the longer the password, the better.
There is no ideal password length, it is recommended that the bigger the better, in this way, the good practices used point out that passwords over 8 characters already have a higher level of security.