Unless you open your wallet in another person device and click remember me in the device and you logout from the device and unknown to you the person clicked remember password and the person login after you have logout.
There's no such remember me when you import your 12 or 24 words seed phrase, a Bitcoin wallet can be accessed by multiple devices, it's not an account where only one user access it, the other device will simply logout.
this means there are 2048^12 or 2048^24 possible combinations.
Not entirely correct because you need to consider the
checksum.For 12 words there are 2^128 possible combinations and for 24 words there are 2^256 possible combinations.