How to make product description to limited amount of words or to add "Read more"

You can do it with something like:

https://pastebin.com/TaumJ7EX

This is just a suggestion, feel free to write your own code.

Thank you Claudio for your answer, but where do I need to add this code (I am new to this stuff) ??

functions.php of your theme.

Thanks for helping out. I did copy the code into functions.php – but still nothing happens, the product description is not getting “Read more” link, they are still full text

@reijopuhm my code it’s an example that trim the content after the fourth paragraph, feel free to write your own code.

Thank you for helping me out, but still nothing happens
I added the code into my theme functions.php and copied the code. I understand that I can change the code, where the “Read more” comes in but in my case the Read more link is not even showing up.

Is there anything you could to do try and help me out? I would really appreciate it!

Not appear because of your content, as I said, fourth paragraph.

What should I add for fourth paragraph to make it work?
I am not familiar with coding myself

I would really appreciate when someone would help me out on this problem. I searched and found out that WooCommerce is not allowing to insert “Read more” (<!–more–>) .

UPDATE: It is working now, but how can I add the same code for “Product description” (not for short description)

Long description doesn’t support read more for products. There is no use for this since we show content on a tab.