Tinytoon is right. They are 8 - 9 weeks of flower time. When they talk harvest they only mean flowering time. You can put as much or as little time in veg as you like to fit your room or outside.

We are veging at the monent, Papaya, Skunk and S.A.G.E. and Northernlights.
They all do very well vegging together.

They do not all do well together in flower. The skunk and the northerlights do well together and the Papaya and sage do well together in flower.

Not the best idea to flower more than one strain at a time but you gotta do what you gotta do.

Harvest depends most on the trichome color. Your mileage may vary.