choose your days according to the properties of their ruling planets. you could then use the hour of mars to add energy to it. a similiar example is for a money working, you could do it on sunday coz the sun rules wealth and riches, and in the hour of jupiter which rules wealth and good luck. or thursday in the hour of the sun. think about exactly what you want, i think this works in levels - hour within day within moon cycle and phase. and watch for retrogrades and the like too.