Because the Upper Study Room is in the Imperial Palace, An Jing and Xiao Changyi didn't want Jing Xingqingyun to always get up early to go to school in the palace, so they let Jing Xingqingyun live in the palace.
The Upper Study Room takes a day off every five days, so Jing Xingqingyun returns home from the palace every fifth day to stay at home for a day.
The children are all grown up now, and they are quite okay with this arrangement without making any fuss, not needing An Jing or Xiao Changyi around all the time.
Having fought battles outside for two years, the female soldiers have greatly improved their comprehensive skills. Now, they no longer need An Jing to train them personally; they just train themselves daily, as the training programs are quite standard. Therefore, An Jing doesn't have to go to the military camp every day and only goes there occasionally.
It's the eighteenth of January.
