Well, exactly where does it say - "Give me only one month for expectation of recovery"?
Well, typically the whole point of someone putting such a clause into a living will is exactly because they don't want to be forced to hang around for month after month in such a condition with no reasonable expectation of recovery.
I suppose if I develop severe and intractable depression and no longer wish to live, I could get an order from Judge Greer allowing me to jump off the Sunshine Skyway Bridge. Judge Greer could order that based on my clear and convincing wishes and right to die, the police would not be allowed to try and stop me.