I'm I right saying that if I add some playlist to some playblock already containing another lists and set Track Separation rule to 1 hour for this specific list that means tracks from this list will be playing no more that 1 per hour if this block active?

Nope.
The Separation rules just tell how long until another track with the same property can be played (if it happens to be selected by the rotation logic).
i.e.: Track Separation rule 1 hr means that the very same track will not be repeated for at least 1 hour, even if the rotation logic would usually choose the same track again.
Artist Separation rule 1 hr means that if you play a track by Rihanna now, no other track by Rihanna will be played for at least 1 hour.
Album and Title separation work similar to Artist separation.

Note: This is always just a minimum time. If you have enough different tracks and set it the logic to LeastRecentlyPlayed, you will just naturally never encounter repeats and it can possibly take days until 2 tracks with similar properties are repeated, even though your minimum separation is only set to 1hr.

And it's not an intelligent matching. If you have Rihanna - Diamonds play now, you can still play Jay Z feat. Rihanna - Run this town right behind that as it's different artists.

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Thanks Mastacheata that is exactly what I wanted to know!