Most cold viruses last for 7 to 10 days which is a week to almost 2 weeks.
However some strains of the cold virus may last up to 14 days which is 2 weeks.
If your cold virus lasts longer than 2 weeks then it could be more serious and you might want to see a doctor.
The reason you should see a doctor if the cold virus lasts longer than 2 weeks or seems to get worse is because in some cases a cold virus can lead to Pneumonia.
The Pneumonia can be a serious health issue which can kill you.
But most cold viruses are just annoying and not serious enough to need to see a doctor about.
Most times when I have a cold virus the cold virus lasts for 7 days but I've had a cold virus last 15 days before.
Just make sure to get plenty of rest, drink plenty of water, orange juice etc and the cold virus should be over within within a few weeks at most.
Sometimes you might get a cold virus soon after you get over one which is also normal.