How long is a common cold infectious?

The common cold tends to be most contagious when the symptoms are at their worst (usually day 2 to day 4 of the cold symptoms presenting themselves). That being said, a cold virus can be contagious...

It lasts about 2 to 3 days

People with colds are contagious during the first two to four days of the infection. Colds pass from person to person in several ways.

1-2 weeks

Two weeks is the common flu , but common cold is 4 days to 7 days usually .