const rand_val = rand(1, 30)*1000;

1, 30 을 변경하여 시간차를 조정 할 수 있습니다.

ex) const rand_val = rand(10, 60)*1000;

10~60초 사이 판매

function clickButton(buttonXPath) {  
    const button = document.evaluate(buttonXPath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;  
    if (button) {  
        button.click();  
    }  
}  
function dropClick(x,y) {  
   var evt = document.createEvent("MouseEvents");  
   evt.initMouseEvent("click", true, true, window, 0,0,0,0,0, false, false, false, 0, null);  
   var cb = document.elementFromPoint(x, y);  
   cb.dispatchEvent(evt);  
}  
function rand(min, max) { 
  return Math.floor(Math.random() * (max - min + 1)) + min; 
} 
function performClicks1() {  
    clickButton('//*[@id="__next"]/div[2]/div[3]/div/div[2]/div[3]/div/div[1]/div[1]'); setTimeout(performClicks2, 500);  
}  
function performClicks2() {  
    const rand_val = rand(1, 30)*1000; 
    clickButton('//*[@id="__next"]/div[2]/div[3]/div/div[2]/div[3]/div/div[2]/div[2]/div/div[1]/div[3]/div[4]'); setTimeout(performClicks3, rand_val);  
}  
function performClicks3() { 
    clickButton('//*[@id="__next"]/div[2]/div[3]/div/div[2]/div[3]/div/div[2]/div[2]/div/button'); setTimeout(performClicks4, 500);  
}  
function performClicks4() {   
    clickButton('//*[@id="__next"]/div[2]/div[3]/div/div[2]/div[3]/div/div[1]/div[2]'); setTimeout(performClicks5, 500);  
}  
function performClicks5() {  
    const rand_val = rand(1, 30)*1000; 
    clickButton('//*[@id="__next"]/div[2]/div[3]/div/div[2]/div[3]/div/div[2]/div[2]/div/div[1]/div[3]/div[4]'); setTimeout(performClicks6, rand_val);  
}  
function performClicks6() { 
    clickButton('//*[@id="__next"]/div[2]/div[3]/div/div[2]/div[3]/div/div[2]/div[2]/div/button'); setTimeout(performClicks1, 500);  
}  
performClicks1();