I know this is a very old post, but here's my workaround for the most recent versions of Enterprise (11.1+) and for AGOL. In Arcade, you can use Now(), DateDiff(), and a while loop to force a given popup to take longer.
This is a really jankety solution, but it works. I recommend using it only if really necessary. It would also work best if there's only one or two popups in particular that you really want to move further down in the pile. Anything more than that would be really hairy to manage well.
Here's the code to do this:
//set target delay in milliseconds
var delay = 1000;
//get start time and initiate the elapsed time variable
var startTime = Now();
var time2 = Now();
var elapsed = DateDiff(time2,startTime);
//while elapsed time is less than target time, check elapsed time until target is met
while (elapsed < delay) {
elapsed = DateDiff(Now(),startTime);
}
//return value for testing. Can use functional code instead
return elapsed;
