Whats the best time to do shanyim mikra for vezos habracha? Is hoshana rabba eve a lechatchila time?
Answer:
Although it is possible to read shnayim mikra from vezos haberachah from when we begin to read the parashah, poskim discuss the ideal time to read. The Mishnah Berurah mentions two different times in two places. In siman 285 (18) he writes that the best time is the day of Hoshanah Rabbah, whereas in siman 669 (4) he writes that the best time is the night of Simchas Torah.
The eve of Hoshanah Rabba is not mentioned as an idea time, but it certainly qualifies as a valid reading.
