The SharePoint relative URL limit is 400 characters
The URL limit in SharePoint is 400 characters. Here is what you can do to avoid the limit.
SharePoint
Permanently delete an Office 365 Group
How to delete an Office 365 group using PowerShell.
SharePoint Online Throttling
A note about SharePoint Throttling and how to avoid it.
Enable custom scripting for SharePoint Online site.
How to enable custom scripting on a SharePoint site. This allows features such as Saving a list as a template to work.