Business Visa ( F)

Can Business (F) holder stay in China for 7 months without going in and out of China?
My colleagues needed to stay in China for more than 6 months and he will be there for training.
Because we are buying some machines from our China Supplier and they needed to train our colleagues to operate it.
Therefore my colleagues will be there for training for 7 months. So Business Visa is the correct to be used for this matter? Pls advise