This goal has the following fine print specified by pretz:
37h per week @ 90% productivity 6.21 hr/day for each of 5 days (4.44 hr/day over 7 days), assuming a 30min lunch break.
Plus ~10 hours a week of language learning @ 90% = 1.3 hr/day
Total = 4.4 + 1.3 = 5.7 hr/day = 39.9 =~40hr per week