diagnostic cp block duration of relief?

My wife had celiac plexus block yesterday at Yale. She’s in constant pain every day, usually debilitating pain with vomiting. Last night she said she was good, no pain, ate a big meal, and slept all night with no issue. But this morning she woke up same as always, curled in fetal position and vomiting all day. She was being tested for neurogenic mals, but the hospital held her too long and she missed her dr appointment. Will have a video appointment from home on Friday. But anyone have experience with how long the block was effective?