You calculate the time and if retiming is necessary, you retime.

They didn’t ask when to retime a run, they asked how. Which, was answered in another thread btw. The one farther down this page.

Well, it's easier with a timer.

It's not when you want to retime a run, because with a timer you would need to watch the whole video again which is just a waste of time and not accurate enough anyway.

Just do the method that suits you best...

Can we please introduce a Dislike feature for posts on these forums

And a commenting feature on the runs.

@lolman-0027 you didn't get it, did you?

@SpiderHako I had understood, the rest was a bit ironic.