This all depends how big the plants actually get, which will depend on the strain although with 60 days of growth you should expect them to get big. Even after you initiate bloom you should expect the plants to double or potentially even triple in height (for Sativas). General rule of thumb is a gallon per foot. If you expect the plants to finish at 5 feet or shorter, then a 5 gallon container will do fine.
Also consider that working with ten gallon pots indoors can be a challenge if you need to move them around at all.