How to remove one variable from an array every 5 minutes?

Question

Java

Hello!
There is an array that contains more than 1000 variables (on the google maps map) ..... and each time it only becomes more.
It took them to be removed gradually, once every 5 minutes.
What is the best way to do this so that the flow does not slow down?

ArrayList<String> blabla = new ArrayList<>(names.size())
blabla.add(asdf.keySet());

for(String str : blabla.size())
{
}

Answer 1

https://metanit.com/java/android/10.1.php