They've completed the circuit of the villa. The Grand High Priestess halts her strides and makes a silencing gesture, then takes an incense burner out of her robes, followed by enough incense that - if you have any sense for the grade of incense she's using - it is going to constitute a significant part, possibly a majority, of the Chelish government's expenses for today.
From a wizard's perspective, this cleric spell takes her a shockingly short time to cast, for a ritual of that expense and permanent effect. It's over in less than a minute.