https://www.joyofsatan.org/www.angelfire.com/empire/serpentis666/Full_Meditation.html
On the instructions for each of the main Chakras there, it says the meditation is best performed on a specific planetary hour and weekday:
6th Chakra on Monday/Moon
Sacral Chakra on Tuesday/Mars
Heart Chakra on Wednesday/Mercury
Crown Chakra on Thursday/Jupiter
Throat Chakra on Friday/Venus
Base Chakra on Saturday/Saturn
Solar Chakra on Sunday/Sun.
Would it be viable to, instead of doing all of the meditations in a single session, to do each of them seperately during their respective day and hour?
Then each meditation would be done once a week, and one Chakra at a time in a fairly random order. Is that sufficient to be effective in keeping the Chakras open if they have all been opened before?