Yes, our old host used to get very jealous when others took 'her' time, too. Sometimes it was a feeling more akin to desperation rather than jealousy. She would feel quite despairing when others took the time so that she didn't come out til our time was nearly up. In fact lots of our alts that used to attend therapy often felt jealous of not getting the time they wanted.
Ultimately though, you kinda just have to trust that however time is divided up in any particular T session is how it best serves the greatest needs of the whole person on that particular day.
Still, that's hard to accept when you feel like you are the one who's been shafted...