Time delta to compute proper velocity values?

The description here says that

Deltas reports changes of coordinates, force, and area between frames.

However, I do not see a way to scale this relative to the actual time interval between the frames (I don’t know how much time passed between frame scans).
To my understanding, time between scans can vary depending on factors such as scan resolution or just jitter due to non-rt access to the sensel (?).

A sensual place for such information would IMHO be SenselFrameData but I cannot find anything like this there.

Here’s what I try to get:

double deltaTime = /* time between two frame scans in seconds */;

float velocity_x = frame->contact[0].delta_x * deltaTime; // in mm/sec

Am I missing something obvious? Thanks for your patience!

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