It's an excellent question. I'm not aware of any such jurisdiction. I can refer back to the Garland trial, when Mr. Justice David Gates, on his own decision, went out of his way, after some of the more difficult days of testimony, to suspend proceedings for that day and give jurors the next day off. He took two breaks during what was a five-week trial. My concern for those much longer trials would be coordinating the court schedule and giving the opportunity to jurors to take a longer break.
To go to the specifics of your question, I'm not aware of that being built in anywhere else.