Also replicated in English (Australia), so I agree. I would have phrased this as "one and a quarter minutes", which works, or "75 seconds" which also works just fine. for the 1 hour 30 request above, I would usually phrase this as "an hour and a half" which works just fine. I agree siri can be very picky though - things need to be phrased a certain way, and adapting speech patterns to that is frustrating.

Other simple time-based requests such as "what's the time difference to singapore?" don't work on siri either, which is irritating as I work across multiple time zones and I'm forever figuring out time differences.