Buried inside aeroplan.ca's SE benefit description I found this little tidbit:
* Effective March 1, 2006, agents will be available to answer your Aeroplan-related questions between 7 a.m. - 2 a.m. (EST).
Translated into other timezones, that means
Sydney: 11pm-6pm
London: 12n-7am
New Dehli: 5:30pm-12:30pm
Hong Kong: 8pm-3pm
I suppose it's only 5 hours that they are closed each day, but in many parts of the world those 5 hours are the middle of the business day. A potential nuisance.