Prizewinner,
I'm glad your partner decided to try to stay the 30 days. At least that's something. My opinion is that every day in therapy gives them a new opportunity to see the light and it's another day sober. My son left rehab after 16 days and that was a 6 month program. It only took us 7 or 8 years to get him into rehab (sigh) but I know that first and many subsequent rehabs often fail.
I'm a big believer in really long term programs. My sister did a 2 year program when she was 18 and at the time, I wouldn't have bet a nickle that she would live to see 20. She is now 54 and the mother of 3 boys and has never looked back. Life has many interesting twists.