1.27.2020 Update: I am aware this is not working. ElvUI has completely changed the way that they update buff/debuff text in the latest updates. I will be working on an update in the next month or so for this. I apologize for the inconvenience.
When buff/debuff timer is above the threshold set in ElvUI Config, it will display buffs as HH:MM:SS format instead of "1h" or "10m". Days display as DD:HH:MM with a "d" to note that it is days. Ex: 5d:13:02 is 5 days, 13 hours, 2 minutes remaining. This is mostly due to the contract buff duration.
Font is changed through ElvUI.