Orion Law Management Orion Desktop Articles Reporting KPI - Unbilled Days Updated April 14, 2025 18:43 The Unbilled Days indicator is used to measure the length of time it takes to bill your work. Unbilled Days is calculated by dividing Fee Work In Process by average billings per day. Average billings per day is calculated by dividing the Firm’s total fee billings for the past 12 months by 365. Was this article helpful? Yes/No