How many arrangements are there for the eight characters?

There are 60 years in the main branch year, with 12 fixed months in a year, and 60 main branch days are not limited by months, with 12 fixed hours every day.

So there is 60×12× 60×12 = 518400 ≈ 520,000.

Considering the differences between men and women, there are 52 × 2 = 1.04 million ways to arrange the eight characters.