Delivering The Same Report To Multiple Subscribers

I am trying to figure out some scalability-related requirements for the project I'm working on, and unfortunately I cannot find out an answer to one of the questions by test-running, so I have to ask it in hope that someone has a definitive answer.

When two - or, more - different (distinct) users/subscribers
running the Report Manager from two different machines
[independently of each other] create their two subscriptions
with almost exactly the same parameters (same report name, same report rendering format, to be delivered via email at 6:00 AM every day, etc.),
and the only difference between those subscriptions is in email addresses (to whom the report shall be delivered)...
... when those subscriptions get executed at 6:00 AM,
are they executed only once (because those 2 subscriptions are the same except by whom they were created and to whom they should be delivered),
OR
is each of them executed separately?


In other words, if multiple users create absolutely the same subscriptions (except for a parameter to whom they should be delivered), how many times does the Report Server run that report?


Thank you very much.