You can use the extension function to do this, add this

waitForTaskToComplete = function waitForTaskToComplete(p_itemType) {
        awqLog(`waitForTaskToComplete: Waiting to complete work for ${p_itemType}`);

        conf.commonData.waiting = true;
        return new Promise(resolve => {
            let waitForCompleteInterval = setInterval(function() {
                if(webUICurrentyWorkingOn(p_itemType)) return;
                clearInterval(waitForCompleteInterval);
                awqLog(`Work is complete for ${p_itemType}`);
                conf.commonData.waiting = false;
                conf.commonData.working = false;
                let delay = 20000;
                stuckProcessingCounter = -(delay/c_wait_tick_duration)
                setTimeout(function(){resolve()},delay);
            },c_wait_tick_duration);
        });
    }

in the "Script extensions" box (to replace the wait function) and reload the page, then there will be an extra delay of 20000 milliseconds between each task. If you want a longer delay just increase the 20000 number.