This is a good beginner routine. Please try to do it twice daily. Anything from 30 minutes to 1 hour daily is fine. Remember to get a bandage if you don't have one. You need to wrap the penis at all times so that it can heal in an elongated state at all times.
You can do this current routine of yours for up to 3 months with your bare hands if you do not have a
length master. But like I said, do it twice a day.
You can as well get the broom stick as suggested by
@squirt_inducer_man