Hey people,
I have a gift for you 
Just replace the conversation script in your header by this one :
<!-- HubSpot Chat>
setTimeout(() => {
let s = document.createElement(‘script’);
s.type = ‘text/javascript’;
s.src=‘//js.hs-scripts.com/[your_hub_id].js’;
document.getElementsByTagName(‘head’)[0].append(s);
}, [milliseconds]);
You just have to replace [your_hub_id] by yours and [milliseconds] by your preferred timing. For example, 30 seconds would be 30000.
Enjoy 