I have a  Satanic wealth spell that calls for the formation and empowerment of an egregore/Ivathwolfunheb. But, three other magickians have to participate to expand the strength and power of this working but there is no need for all to be present together, but I would think a working done with...

 In the list of Demons there Astrological degree times are listed, in the different Demons profile. Are the Demons only to be called during these astrological degree times or are these the degrees, when they are most strong?