Short resolution times: If most tickets are resolved within a few hours, showing "0.2 days" is less intuitive than "4.8 hours".

Granular tracking needed: For support teams aiming for SLAs like “resolve within 1 hour,” using days may obscure important insights.

Visual comparison: Bar or line charts showing values like "0.25 vs 0.5 days" look almost identical, but "6 vs 12 hours" shows more visual difference.