Starting week 8 veg. No rush on time. If it was yo...

Probably a week. You don’t want them outgrowing the edge of that container too much is a good rule of thumb

As @growcn, said mate.

It depends on the stain and how big you want the plants. Your plants are far enough along that you could switch now if you want. Your plant could double in size depending on the strain so you need to flip early enough so you have room in your tent for the mature plant.