Like pepper23, I have an EGO wacker and lawn mower. I love them both! The batteries are interchangeable so I can use one tool while recharging the second battery.
Under stress, heavier weeds, I get about 40 minutes of run time. Lighter weeds/grass ups that to 50-55 minutes. Recharge time is about 50 minutes so as you see that while you are working with one, your battery is charging so you can be ready for some serious work time.
Mower does a very nice job as well!! It's work time varies from 40-55 minutes depending upon stress. The wetter and taller the lawn, the less the cutting time is.