Mayhem Blitz question

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I am a bit uncertain based on a review I read here (albeit from 2014) that seems to contradict the time for Part 1. The review states this has been amended to no more than 2 hours, but the instructions in mine still say 6-12 hours. What should it be?

Also, I am using these on new rads, not installed yet, so I'll be rinsing out with de-ionised before I put the loop together. Do I need to use Part 2, or providing my flush from the rad after rinsing is the right pH, am I good to go?

 

[Legend]

The instructions that come with the Blitz kit are the most up. Follow them.

It is recommended to flush with part 2 after using part 1.

So at least 6 hours it is then. They are new rads, already rinsed with loads of de-ionised but there's still stuff coming out.

Can I use part 2 on just the rads then, or I need to get the whole loop in in order to do that?