When adding leave entitlement you should primarily use leave types. Since you are getting 160 hours a year you can create a leave type called Annual leave and add 20 (160/8) days as leave amount for that leave type. IceHrm assumes an 8 hour work day. So when you do that you can apply for a leave for 1 day or 1 hour. If you apply for a 1 day leave your leave entitlement available leave count will become 19. If you apply for one hour it’ll take away 0.125 from your leave entitlement.