Avoiding overuse of stats_get_csv

I’ve switched ON Site Stats, and am using stats_get_csv to retrieve the 3 most popular posts/pages of the last 15 days using the following code:

if(function_exists('stats_get_csv')):
        $popular = stats_get_csv( 'postviews', array( 'days' => 15, 'limit' => 3) );

My question is, do we need to limit the number of times this API call can be made?

I am thinking to cache the result for half a day, since the repeated API calls will be unnecessary.

What is the right way to cache the $popular results?

Thanks.

https://www.ads-software.com/plugins/jetpack/