This is kind of the "ever present" question for polyamorous people. There are standard jokes about the "polycule calendar" ... For me it helped that I had one partner who I always saw on the same day of the week. But early in the week I made my calendar for my friends/lovers for the week and yeah- it was often, first come first serve.. or if I hadn't seen someone "enough" I would contact them first and try to get some time... and sometimes you are just more in the mood for the kind of relationship you have with one person over another, and I find in those days there really are times I Spend more with them than others... it's all ebb and flow and as long as I am checking in with my other partners that they are getting what they need from me (as much a possible) I just go with the ebb and flow. Dopes that make sense?