Pass through the midst of the camp and command the people, ‘Prepare your provisions, for within three days you are to pass over this Jordan to go in to take possession of the land that YHWH your God is giving you to possess.’
Joshua 1:11
Three days in this verse is a metaphor of resurrection into a new life. Notice that Joshua says "within 3 days". This echoes the ambiguity of Yeshua's predictions of his death and resurrection. After three days & three nights or on the third day? All three phrases mean "At least two sunsets, but less than four."
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This Book of the Law shall not depart from your mouth, but you shall meditate on it day and night, so that you may be careful to do according to all that is written in it. For then you will make your way prosperous, and then you will have good success.
Joshua 1:8 ESV
Every good leader should study Torah (God's Law). Success takes many forms, but it can never be "good" unless it conforms to God's instructions.