There is no limit to the number of chat templates, you can create as many chat templates as you need. Chat templates only consist of text.
The command template has a maximum of 255 characters and cannot contain spaces. If you want a command template consisting of several words, you can use separators such as "-" or "_". But for template content, there is no limit to the number of characters/words and can have spaces in it.
Learn more about the chat template in this documentation.