You can apply for hourly or First/second half day leaves in AttendanceBot. 

1) Please type "Apply" as a DM to AttendanceBot and click on Apply button. 

2) Select the leave type, duration as few hours, pick the date and select the time slot for which you wish to apply leave and hit confirm. If you wish to apply for first half, please pick "First half" as the leave duration and likewise "Second half" for the second half of the day. 

AttendanceBot will show hourly leave in the "summary" command and the leave report

The leave type you are planning to apply should have the "hourly leave" option enabled by the admins of the account and only can employee apply for it. 

Note: If you wish to edit the approved leave, you need to delete the existing leave and re-apply it. Here's how you can do that - https://attendancebot.freshdesk.com/a/solutions/articles/17000131566