Shinyapps Usage limits and Subscriptions


I have a starter subscription with 100 actives hours included in my billing cycle.
What is not clear : Are these active hours a sum for all the the application or by application?
With the starter subscription 25 apps are possible. Does it means that I have a credit of 2.500 hours/month?

If not, can someone explain me why I have more than 1300 active hours counted on my curent billing cycle? Yesterday my account was locked due the usage overdue. Ok why so late If only 100hours are available?

Thanks for your help.