Science/Evidence based guidelines on number of character for alert messages?

I'm designing a design system for multiple web-based app to manage customer license and account. I'm trying to set a character limit for these messages.

The company has culture of being verbose, and I'm having a hard time trying to convince on reducing text on alerts. Using the argument of being clean like Apple / Google guidelines, mobile first, doesn't work. I need to dig deeper and find something more rational like backed by academia or experts in the field.

Alerts would be things like this: https://mailchimp.com/help/about-error-messages/

Is there any study on the maximum length of characters for error or warning messages for an app?