I decided to check the timer entry that is mentioned in the forum.
For the experiment I made 3 timer recordings from different channels (bit rates are different)
Skin from the PVRS folder on a computer with 3 timer entries.

Record # 1 (coded HD quality channel).
At night I programmed the recording for 4 hours. I checked it in the morning, and the recording lasted only 02:34:37 = instead of the programmed 04:00:00
File check showed that the recording created TS format 2 video files
Night recording skin # 1 from MediaInfo utility

Record # 2 (uncoded SD quality channel).

In the afternoon I decided to recheck by programming it for 6 hours on a timer, at the same time I checked the recording process from time to time by scrolling through the time (pressing the record button to show the recording process)
First 2 hours = normal recording, but then there is a sharp jump in forward recording time:
When checking the records after 2 hours and 20 minutes, the time is normal.
And when checked in time for 2 hours and 38 minutes, it showed that the recording has been going on for more than 5 hours and 10 minutes immediately took a photo (it turned out a photo - a little shaking)

Stopped recording
I checked the PVRS folder, it added 2 TS video file formats
Skin of daytime recording # 2 from MediaInfo utility

Record # 3 (uncoded SD quality channel).
I continued the timer check and set 1 hour and 50 minutes.
This check is OK = normal entry at 01:49:29
I checked the PVRS folder and added 1 TS of the video file format less than 4 GB.
Skin of recording No. 3 from the MediaInfo utility

Summing up the results of the experiment
As you can see, if the record is more than 4 GB, then a new record file is created to extend the record. When viewing a file with the MediaInfo utility, if the record is more than 4 GB, then the first file shows incomplete information about the file, and the second (the record ends with Hellobox 8) shows the full information about the file. Also full info if the file is shorter than 4 GB.
Regarding recordings # 1 and # 2, it can be seen that the shortening of the recording duration occurs when the second TS file is created (recording extension after the first 4 GB)
P.S.
The question to the programmers is why, when writing to a disk formatted in NTFS format, the record is truncated by 4 GB (as with a formatted disk in FAT32 format where the file length is up to 4 GB)? If the formatted disk is in NTFS format, the length of the files is not limited in length (the video file can be 6 GB ... 10 GB ... 30 GB ... 80 GB ....)
Suggestions for solving these errors:
1. Hellobox 8 could recognize in what format the connected HDD or Flash is formatted, it is in NTFS, FAT32 or exFAT format.
2. If the disk is in NTFS format and the recording is more than 4 GB = recording should continue in one video file and without any division into several files in size by 4 GB + .. GB.