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scan_time
will only be equal to time_increment x number_of_samples
if it is a full 360 degree scan.
In the case of the message you showed it is only a 180 degree scan therefore the scan time is twicetime_increment x number_of_samples
.
As described scan_time
is # time between scans [seconds]
not the duration of the scan.
Think of scan time as the time taken for a full rotation of the sensor even if it's only producing data for part of that revolution.