I would think 6 weeks is plenty of time. I thought 2 weeks was plenty before I started making waves about my son and his math and then it took 2 more weeks and the final solution was just skip him to the next grade. I am not quite sure how that is going other than his writing needs improvement (but would probably be fine if he were still in 3rd) so he is going to need a bit of extra tutoring in that. I assume his Spanish is just fair too because he lost out on a year of that and he has no Spanish speaking relatives. I will know more in a couple of weeks at the conference night. I assume now there isn't a need for much differentiation right at the beginning of a skip but there possibly might need some as the year goes on (especially in Math and Reading in English).

...reading is pleasure, not just something teachers make you do in school.~B. Cleary