You don't have to wait to earn a Heart back! Practice previous material to restore a lost Heart.
1. Tap on the Hearts icon towards the top
2. Tap "Practice"
Each lesson practiced will restore one Heart.
Other ways to restore Hearts:
- Wait: Typically, your next Heart will refill automatically every 5 hours, so your total of five Hearts will restore within 25 hours.
- Practice a gilded skill: You can earn +1 heart by practicing a gilded skill
- Gems: For those who still want to binge on Duolingo without taking a break or taking the time to review lessons, Hearts can also be refilled with Gems.
- Plus: Learners with Duolingo Plus can turn on unlimited Hearts.
NOTE: You will not see Hearts when practicing a gilded skill or completing a practice through the Heart tab.