20 Hours before I can try again?
I'm getting on a flight and wanted to practice but realized I have to wait 20 hours before being able to access any lessons. Doesn't this defeat the purpose of trying to practice material I got wrong?
I haven't encountered this yet because it's still being tested but I've seen people say that they are able to practice lessons that they've already completed to build up the health needed to complete a new lesson. Will it let you do that?
You can review and it will build your health back up. You don't have to wait 20 hours if you don't want to. Just do five reviews.
Urks, sounds weird (If I understand you right...). It remembers me on the behaviour of so called "freemium" games, especially on mobile devices. If someone does not know it: Let's say, you have a car racing game and you can download and play it freely, but after a while your car gets damaged, so that you have to drive to a repair shop. And there you can choose to wait, till the game allows you to play again (and the car is repaired) or you can now pay for shortening the time needed to "repair" the car. Mostly the players don't want to wait, so they pay and the developers earn much money. May be Duolingo newly tests also this concept? Was there a possibility to pay and get rid of this waiting time?
The learning process is slow. I just completed the first level and it will not let me advance to level 2. It is a requirement to participate in discussion but some of them are locked.