OP didn’t say anything about reading time off a digital clock.
What about the opposite scenario of reporting the time you read off an analog clock? Would you translate to digital first?
In your specific scenario, sure, it would require extra work to convert it, so I’d just read it as is.
But when making plans, and especially spans between two different times, my brain thinks of time as portions of a pie chart, and I’d have to translate 3/4 to 45 minutes.