Perhaps none at all:
Nuns know they are signing up for a hard life when they take their vows, stretching from dawn prayers to gruelling missionary work, but three nuns working in a community near Rome decided they had been pushed too far when the local bishop demanded they double up as personal cleaners for two ageing priests.
The nuns, supported by their mother superior back at their order in Lucca, refused to interrupt their good works with local youngsters to pick up mops and start cleaning.
After digging in their heels they were fired for their disobedience by the bishop, Marcello Semeraro, according to La Stampa newspaper.
Would the bishop have asked the same of younger priests had there been aging nuns around to care for?