How long does it take on the underground from Victoria to St Pancras International?

We have to book in for the Eurostar on Monday morning at 8.00 am and I am trying to work out what time I will need to catch the Oxford Tube to take me to Victoria.How long does it take on the underground from Victoria to St Pancras International?
it's only about 10-20 minutes on the tube itself from Victoria to Kings Cross, but check out the engineering works on the Victoria line at the moment as depending on when you want to travel it could disrupt your journey - look at www.tfl.gov.ukHow long does it take on the underground from Victoria to St Pancras International?
Should take about 20 minutes, but allow 30 in case there are delays or if its crowdedHow long does it take on the underground from Victoria to St Pancras International?
15 min max Dude

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