The register that controls the Intermeasurement period says "sysrange__intermeasurement_period: Time delay between measurements in Ranging continuous mode. Range 10ms-2.56s (1 code = 10ms); Laser-safety-protected version with minimum limit allowed (copied from NVM at boot). FW clips lower user inputs to min limit.
So 2.5 seconds is clearly possible.
I doubt you are doing anything wrong. It's just the code that controls that entry appears to be limiting you.
Use the GUI to test and then migrate to your own code to get the real intermeasurement period.
There is lots of code on the ST web site that runs on the same Nucleo and expansion board you have.
I'd start there and you can modifiy it to suit your needs.
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