Particularly p232 Increased Duration "If a magician wants an effect to last longer than just the current contest, he must state so when casting the spell. The magic has an additional resistance to raising duration, as shown by the duration chart."
The participants in the ceremony give extraordinary support, so, for example a congregation of 500 individuals (+20) worshipping on the High Holy Day (+20) in a Sanctuary (+20) get a total bonus of +60 - which, coincedently is the penalty for a 1-year sorcery duration...
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