Suppose Winger's friend is placed into a black box, thoroughly isolated from the outside world.
He constantly observes an atom with a delay of some microseconds. According to Zeno effect, atom's lifetime will increase.
He writes his observations to a log.
After a day passed, the box is opened and Wigner's friend asked when the atom decayed.
Will the increased atom lifetime be seen by the observers who were outside of the box?