I have a Trial subscrition of Azure.
On that subscription I have 4 Extra-Small virtual machines (Windows).
When I go to "my bill", I can see that the daily usage of compute hours is 4 (four) hours.
How come 4 machines cost 4 hours a day?
Even if a extra-small represents a fraction of 1 core (1/6 I think), the daily usage shoud be 16 hours (4 machines x 4 hours).