Each planet time in s day it's 4 times a day in its 24 hours of time from and in magic the day in itself is measured by the Sun in itself, it's dawn and rising. There might still be time if you're looking when void starts and ends and it not you could also start it in another day such as Sunday or Friday but if you want to do the square as per the book then following Thursday at worst, there's still time to do this square.