Here’s where things stand for the Java 11 exams.
|exam duration||1.5 hours||3 hours|
Notice you have a little more time per questions on the upgrade exam. However, the passing score is higher.
As a point of reference, the 1Z0-819 is replacing the 1Z0-815 and 1Z0-816 exams which had also had 180 minutes to answer 80 questions and a passing score of 63%.