Your answer, "Eight", is not correct.
The correct answer to
How many days after Jesus take Peter, James and John to a high mountain?
is
Six
as shown by
Mark 9:2
which is
- KJV
- And after six days Jesus taketh with him Peter, and James, and John, and leadeth them up into an high mountain apart by themselves: and he was transfigured before them.
- NIV
- After six days Jesus took Peter, James and John with him and led them up a high mountain, where they were all alone. There he was transfigured before them.