The complete chakra meditation is done in several ways, I will try to explain it as best as possible.
1. When you meditate in a general way on all the chakras, without specific time, potentiating the chakras all at the same time.
2. when you have a chakra that you want to potentiate but without leaving the complete meditation, then for example you want to potentiate the solar chakra, you choose the hour of the solar chakra and you start the complete chakra meditation, but at that specific hour the energies of the solar chakra will predominate and will give the extra that you want to have.
3. Focus on only one, usually the weak ones. If you want to focus on these, then choose one and do it in the corresponding hour for a prolonged period of time, when you see that it is strong and potentiated, then move on to the next one.
There are several ways to work them, the decision is yours and with the time you have available.