Scanning the table of rates made in the monthly Alpha http://www.alphabank.gr/files/personalbanking/Alpha_Miniaia_Proodos_23032010.pdf
Frankly I can not understand why someone would choose the 12 month program where the 18-month gives a better rate for each term not exceeding one year and can interrupt the program whenever you want without penalty.
I believe that the table time deposits must be placed on Alpha Bank were obtained from 18 months, including:
3 months: 2.3
6 months: 2775
12 months: 3175
Particularly interesting:
4 months: 2925 &
8mino: 3.05