VHS generation loss (50fps)

What happens if record (make copy) from one tape to another tape 20 times in PAL. Capture: EasyCap (Chip UTV007) VCRs: Player (1st generation): LG L396 Recorder: Sony SLV-P53EE 0:00 - 1st generation 0:17 - 2nd generation 0:35 - 3rd generation 0:53 - 4th genetration 1:10 - 5th genetration 1:28 - 6th genetration 1:46 - 7th genetration 2:04 - 8th genetration 2:23 - 9th genetration 2:41 - 10th genetration 3:00 - 11th genetration 3:19 - 12th genetration 3:39 - 13th genetration 3:59 - 14th genetration 4:20 - 15th genetration 4:42 - 16th genetration 5:04 - 17th genetration 5:26 - 18th genetration 5:49 - 19th genetration 6:12 - 20th genetration