Only the last dungeon is missing now in the main quest. I recently did a playthrough of the main story and even for me, with the knowledge of all levels, It took about three hours to finish.
My initially targeted goal (for normal players) for the required time to beat the main story of the game is five hours. The missing dungeon should take about one hour. So far, the testers needed about 150-200% of my time. Therefore, this goal should be easily reached.
After all, I am really pleased with the results of this year. Hopefully, the new one will be similar. I wish you a happy New Year 🙂