magento2 – Magento 2 Increase your guest's session time and keep items in the cart for 20 days.

I want to increase the session time of the guest users in magento. If the guest adds to the cart and just goes for lunch or any other activity putting his website open in the browser, when the user comes after 5-6 hours, he checks the website after 6-7 days and sees his item added to the cart.

How can we do that? How can I create a persistent guest session so that whenever a guest guest visits the site, he sees his product added to the shopping cart?

Currently, if the customer comes after 4-5 hours, the basket is empty.

Any help would be appreciated