When reading a Rakhaawah word with sakoon on it, what would be its duration?

Question
slaam o ailkum

When reading  a Rakhaawah word with sakoon on it, what would be its duration? Would it be one Haraka or less. And the same question about a word with Siddah and Tawassit with sakoon on it.

Answer
Wa alaikum assalaam wa rahmatullah wa barakaatuh.
We can only measure vowels and mudood in terms of the harakah, or length of a vowel in tajweed.  We cannot measure other items in the same terms because they are based on taking the sound and length from a qualified teacher, but not on a derivative of the length of a vowel.  The timing of rikhaawah, tawassit and shiddah then should be taken from a qualified teacher and not from a vowel count or partial vowel count.