Express duration, which started in the past
I have an expression: 'xyz' service is unavailable.
I would like to improve this information, by adding the duration, how long this has been unavailable.
- 'xyz' service is unavailable for 5 mintues - This comes to my mind first, but I think this refers to the future, that it will be unavailable in the next 5 minutes?
- 'xyz' service is unavailable since 5 mintues ago - maybe this is the corect?
- ??? - your idea? :)
How could I express it correctly?
Thank you very much,
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