You message was long ago, but you wrote about 8 hours of learning/day and immersion, so I assumed it is 8 hours of dedicated learning + immersion)
I can agree that leaving in a country is a grate push for learning, but in my experience dedicated learning helps much more after some period of time when you accustomed to livestyle in another language, for example in my native language I wasn’t improving for a long time, as well as in English, it’s gradually getting better last 2 years, and I’m doing basically almost everything with it, including speaking with my family day after day, but it’s not very fast as it can be with just 1 hour of dedicated learning.
If we assume that person can concentrate 8 hours without being destructed and learning only 1 instead, do you think my plan makes sense?
We can add a little more speaking + mistakes sentences cram if we lower amount of hours on words and assume 15 or 20 or 25 is possible in 1 hour, and immersion will do the job as well (20 repetition rule, mb like 40 rule for Japanese but in 1k immersion where at least 500 is reading it shod be at least 6k words(also wee add many to Anki so we can assume at some point they just work together and Anki speed increases))