Set number of characters in product desciption

I would like to restricted the number of characters in the description field in a product.
How can I do that?

You can use the Dolibarr database to do that:
if you’re familiar with databases you can use phpmyadmin and then look for a table llx_product
There is a field called description where you can restrict Length/Values by the number of characters desired.

you need to modify code. however a crude way of doing is change type of description filed in Table llx product, it will throw a database error as it wont be able to save.