Bantimes is a group power that allows you to set ban rules (predefined reasons and durations for bans) on your chat.
First, assign the power to your chat. Then, click the "edit" button next to the Bantimes description in your group settings.
This will open the rules manager application for you to easily add, edit or remove ban rules:
Once you've added your ban rules, go to your chat, click a user and then the "ban" button. A dropdown box will appear for you to choose which ban rule you want to use. When selecting a rule, it will automatically fill in the reason/duration fields with the values you have set.