Generally, Song Lan gives herself a checkup every six months.
The main purpose is to assess the extent of damage and deterioration to her skin and internal organs, and then decide whether to replace her body based on the results.
If she doesn't need to, that's cause for celebration: one more hassle she can avoid.
If she does, she might sigh and, as usual, remark that it's such a bother. Then she'll look for another body and negotiate a "deal" with its owner.
With the power of the Taotie Mask, Song Lan continually replaces her body and keeps cultivating. This is her path to becoming an immortal.
