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The rule about 30 seconds.

Hi. Today I will try to tell you about a one rule. I think it is very helpful.
I call it - The 30-second 30 seconds rule.

A core of the rule is to spend 30 or 60 seconds to write a basic idea after every important conversation or end of reading.
It will help you to remember basic idea or sense.

 

The second paragraph is okay gramatically, but it might sound more natural to say something like:

The idea is to spend 30 to 60 seconds writing the main idea of every important conversation or reading.

This is a fairly common US accent. The video you linked to is of a man with a slight southern accent, which is where you're most likely to hear this.

Either can be correct based on the context. English has no real equivalent, so I am still trying to understand this myself. This illustrates "verb aspect" - imperfective (читать) or perfective (прочитать). Imperfective verbs imply that the action is ongoing. Perfective verbs have a connotation of completion or incrementation. I'm still looking for an excellent explanation by a native Russian speaker, but hopefully this helps a bit. http://www.russianlessons.net/grammar/verbs_aspect.php

These may be correct but you wouldn't hear people in the US say them that way. We would most likely say: I'm not offended by anyone.