Creation is getting the feeling that this Entity of the Far Tapestry has definite opinions about how reality should work around her, and they Do Not involve Esta recovering HP corresponding to his character level (12) plus Merrin's healing bonus if she exceeds the DC by 5, exactly at the end of her first hour of work. Plus a corresponding 17 points of nonlethal damage.
...it wouldn't make much of a difference, after Esta nearly drowned and his HP dropped to 0 about that, he's got more than 34 points of nonlethal keeping him unconscious. Esta is probably going to stay out until he's done a day of natural healing, or Long-Term Care if Merrin cares to roll her Heal about that too.
But Esta's, uh, 'vital signs', can improve on a continuous basis as the Far Tapestry Entity applies more healing. If that. Works better for It.