Extend promotional pop-up display timing beyond 30sec max

Trying to find a way to further customize promotional pop-up settings. I would like to set my own custom pop-up display timing beyond the Squarespace 30 second maximum, like 3 minutes for instance. For context, I'm using the promotional pop-up function as an idle browsing pop-up, where a user will be alerted that the site will return home if they don't close the pop-up within 15 seconds for example. Alternatively, if someone knows of a good idle browsing pop-up plugin, I'd be interested in that as well. 

Screenshot of 30second max setting in promotional pop-up settings:

Anyone interested in a workaround, I just created a custom CSS code that works for me. Now my promotional pop-up appears after 165 seconds. 

//CUSTOMIZE PROMOTIONAL POP-UP TIMING//
.sqs-slide-wrapper[data-slide-type="popup-overlay"] .sqs-slide-container[data-slide-type="popup-overlay"] .sqs-slide {
    transition-delay: 165s;
}

This does work but it appears to interfere with interacting with buttons and links properly.