How to calculate the duration(time) of an EDF file?

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I have an EDF file who has 73 records and each record is 1 second.

my edf viewer image

I calculated the duration of that EDF file in 73 seconds,
but when I used a standard EDF viewer I saw that the duration of that EDF file is around 63 seconds.

commercial edf viewer program image

My way is wrong.
what is the correct way of calculating the duration(time) of an EDF file?

Info Recording:

Identification code: 0
Local subject identification: 111111-1111 X 30-DEC-1899 Sanna_Testi
Local recording identification: Startdate 21-NOV-2017 dcfgyfgj X X
Startdate of recording: 21.11.17
Starttime of recording: 13.45.29
Number of bytes in header record: 6,912
Version of data format: EDF+C
Number of data records: 73
Duration of a data record: 1 seconds
Number of channels in data record: 25

The specification of an EDF can be found here: https://www.edfplus.info/specs/edf.html

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