stand alone mode; recorded time

[Speedytec]

How accurate is the recorded timing interval in Stand Alone mode normally?
Was viewing a few recorded logs to generate some lap times, but the HPT log seems off by a few seconds on a 2 min track lap...

If off, is there a way to adjust the internal clock/timer on the VCM module?

[Keith@HPTuners]

It's likely not reliable enough to use for lap timing.

There is no way to adjust the clock.

[Speedytec]

As a rough guess I think the recorded time is maybe 5-8% off, which is pretty enormous for a clock timer...