as with all Last Day of Work games, your device time effects the game's time. So if you speed up your device time after planting crops, they will be ready instantly. But when you want to put your device time back to normal, it will take longer for crops to grow as it will think it is a day behind (or however long you set your time ahead the first time). For example, most crops take 9 hours to grow. If I set my time ahead 1 day, they will be ready instantly. However if I set my time back to the real day, then plant crops, it will be stuck on 9 hours for a full day, THEN start counting down. To set time back to normal without this happening follow these steps:
Turn off wifi and cellular.
Keep putting your time ahead 1 day and going into the game every time you set it forward until you get an error message saying you cannot connect/tap to try to reconnect
Completely exit the game
Turn wifi on
Set date back to real time
Go on to game
The game time will still be ahead, but your device time is not, and you can keep planting crops without it adding a day or more of grow time.