Just the possibility
Well.. this depends on the amount of time you are willing to invest to crack your password.
The time is basically depending on 2 factors:
- Amount of passwords to check (which itself depends on 1) password length and 2) the set of characters used)
- The amount of combinations your machine is able to test
For example:
If you were using 0-9, a-z and A-Z.. thats 10+26+26(=62) different characters.
If you only remember that your password was between 6 and 8 chars that would result in
62^6 + 62^7 + 62^8 (=221.918.520.000.000) possible combinations you would have to try.
On average you have to serach 1/2 of the search space to find your password (50% chance after 50% being tested).
Thats still quite tough.
The more you remember from your password, the easier it is to reconstruct it.
I'd say anything above 8 characters is not possible to crack in an appropiate amount of time (currently).