Corrected time from 51s 017ms to 50s 933ms upon verification.

Video reviewed was at 30fps Here are the screenshots of frames used (frame number at bottom left):

Corrected time from 40s 167ms to 40s 133ms upon validation.

Here are the frames used (frame number at bottom right):

Corrected time from 1m 12s 283ms to 1m 12s 200ms upon validation.

Here are the frames used (frame number at bottom right):

Corrected time from 18s 783ms to 18s 767ms upon validation.

Here are the frames used (frame number at bottom right):

Corrected time from 23s 763ms to 23s 733ms upon validation.

Here are the frames used (frame number at bottom right):

Corrected time to 41s 733ms upon verification.

Here are two screenshots from the start and two from the end to show which are the frames I took for counting (frame number at bottom-right):

Corrected time to 18s 167ms upon verification.

Here are two screenshots from the start and two from the end to show which are the frames I took for counting (frame number at bottom-right):

Corrected time to 40s 767ms upon verification.

Here are two screenshots from the start and two from the end to show which are the frames I took for counting (frame number at bottom-right):