Completing 800 class hours means learning German for 8 hours every day, doing nothing else, and not necessarily having enough time to practice and accumulate language materials.

Conclusion: It is suggested that it takes at least one year to prepare for Karl Dehloff from Foundation 0.

Answer supplement:

It's okay to study for 800 hours a year, but you may not be able to do well in Telford after studying for 800 hours.

If there is a local Goethe Institute, you can choose evening classes or weekend classes once every two months. And every time you upgrade, you have to take an exam to test your level easily.

If you are in Beijing, Beijing Foreign Training Institute or Beijing Institute of Technology is also a good choice.

My classmate went from learning German to Calder Ford for about two years. Of course, you should also look at your language talent and hard work.