Set custom timer for Slick slideshow based on field value
Here's my final mrpeanut.js:

(function($, Drupal, drupalSettings) {
    Drupal.behaviors.mrpeanut = {
        attach: function(context, settings) {
            var slider = $("#slick-views-slideshow-page-1-slider");
            var slideTime = drupalSettings.slideTime;
            var nodeIdArray = []
            $('article').each(function(i){
                var nodeAbout = $(this).attr('about');
                var nodeID = nodeAbout.substring(6, $(this).attr('about').length);
                nodeIdArray.push(nodeID);
            });

            slider.once('mrpeanut').on("afterChange", function(event, slick, currentSlide) {
                slider.slick('slickSetOption', 'autoplaySpeed', slideTime[nodeIdArray[currentSlide]], true);
            });
        }
    }
})(jQuery, Drupal, drupalSettings);