Mary has now absorbed the Divine Remains Bone with excellent compatibility, and should directly ascend, with promotion and bone absorption happening simultaneously. We must quickly light the Tears of Blood Underworld Candle for her to protect the ascension.
...
Mary's ascension ceremony was quickly arranged.
The two different grades of candles needed for her ascension are both available at Kamiyagawa's hands, and the "Candle-making Monk Workshop" had already prepared them long ago.
The Tears of Blood Underworld Candle can greatly enhance and stabilize the ascension process.
In addition, Mary's current power of faith is very abundant.
So, there's no need to worry about her failing the ascension.
Judging by the burning speed of the Tears of Blood Underworld Candle, Kamiyagawa estimated this ascension would last at least about a month.
Ascending from Rank B to Rank A is the Arajin's evolution towards becoming a true deity, so taking longer is understandable.