Can anyone tell me how much time has passed since the Dom'Kavash left Sirius sector, in relation to humans' arrival there?

Timeline
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by the FL story the ruins are millions of years old
by the CF story they left about 10.000 years agoreason for the difference: it is logical to assume that there is a time span from creation to exodus
also there was the need to keep the exodus relative close to our time due to the ongoing war -
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The Dom'Kavash are a mysterious race existent around the post-Cretaceous period which are responsible for the majority of the alien artifacts and for the existence of the Nomads in the Sirius sector
(and, presumably in the other sections of their vast empire). Nothing
is known about their physiology, but little more is known about their
culture. They mysteriously disappeared millions of years before mankind
evolved for unknown reasons.QuoteSpeculationEdit
There is Speculation over whether the Omega 41 System going nova
caused a wave of radiation that wiped them out. However, no skeletons
or remains have ever been found, perhaps suggesting that they were invertebrate.
Most architecture in their ruins has an outwardly primitive look,
although this may be due to the sheer length of time they had been
abandoned as opposed to actual design style.
EDIT:CF story form ModDB:
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Disappearance of the Dom’KavashWhere were these masters, do you ask? Where did they come from? The
answers to these questions begin with understanding the history of an
ancient race. It began with the Kavash. They were the first sentient
inhabitants of our galaxy. Eons passed. Their achievements and glory
knew no bounds. Free from harassment by other races, they eventually
took to the stars and came to rule over a domain that spanned the great,
celestial spiral from rim to core. For this reason, we have come to
know them as the Dom’Kavash - for who could ever rival the glory of the
only race to ever exercise Dominion over all that mankind has ever
known? The overwhelming success of this alien species truly began after
their migration from their home, far towards the edges of our galaxy, to
the Inner Core. It is there in the dense patchwork of stars that they
found resources nearly inexhaustible. So, too, did they harness the raw
energy required to operate their crowning technological achievement: the
hypergate. Equipped with a wide-reaching network of hypergates, the
Dom’Kavash extended their imperial might to every corner of the Milky
Way.Building further upon this success they built three gates that were
greater, still. These allowed exploration of neighboring galaxies for
the first time. The Dom’Kavash were no longer alone. There were others. A
race had risen to dominion in each of the galaxies, just as the Kavash
had here. For many an age, the four races held goodwill for one another.
They coexisted in peace and harmony. Then that came to a tumultuous
end. Two of the races demanded of the Dom’Kavash much more than the free
exchange of commodities alone. They had grown accustomed to the
superior technology of the Dom’Kavash and, envious as they were, wanted
it for themselves. War broke out. The third race reluctantly joined and
abandoned its neutrality. They were unwilling to be left behind in the
struggle for control of hypergate technology. The Dom’Kavash were by far
the most powerful, but could not withstand the combined might of all
three neighbors.Withdrawing from the galactic rim during the first century of
fighting allowed the Dom’Kavash to consolidate their people in the Inner
Core. The war raged on. Hypergates were razed to prevent them from
falling into enemy hands. Their seat of power became insecure. With the
network in tatters, it seemed as though the empire was finally on the
brink of collapse. More systems were lost, but the Dom’Kavash would
never surrender. Invaders were crushed with seemingly unfathomable
force. The Inner Core could not be ceded. For every life cheated of the
defenders, four were taken in kind from their opponents. It did not
matter. Their position as the years dragged on grew desperate. Then
something unexpected occurred. A signal was received from Nomad sentries
near their distant, beloved homeworld. To respond to the emergency, the
Dom’Kavash created a gravimetric anomaly. It was a risky gambit. Using
the anomaly as a slipshod hypergate, they jumped to a system near Sirius
to better evaluate the situation. In doing so - in spite of all odds -
they would inadvertently land upon the lap of an unbeknownst, expanding
Coalition presence in Altair. -
Thanks, need that for some logical timeline in Ancient short story...