If you open reaper, and are using the asio driver for your device, reaper should show you in the top right corner what latency the audio driver is reporting at the buffer size you are using.
Now, this isn't measured by reaper, it's just what the driver reports. It should be accurate, but often isn't, commonly because some drivers don't allow for converter latency, and any other safety buffers beyond the asio buffer size.
The reason it's worth looking at is that if the figure reported is larger than what you measured, then likely something has been done wrong in your measuring procedure.
Most likely having the signal being routed back to the record input through the mixer in the audio interface, so that it doesn't go out of the interface through a D/A converter, through a cable, and back through a A/D converter.
That's the real latency you get with analog sources and monitoring.
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