Nuff , you are correct.
Learning as I go, I wanted to space the developing sessions at about 3 monthly intervals, and I can only accumulate about 8 rolls in that time.
I mix solutions of 750mil, so I will actually get more than 6 sessions which will probably take 1.5 to 2 years.
I could probably do up to 16 rolls per session, so I feel the 5 L kit would be better value if shared by 2 or 3 users.
Also there is the shelf life of the kit after the containers are opened, I think I read that one constituent has a life just exceeding 2 years.

Hope your weekend goes well, I have good success except that the white residue from the stabilizer, occasionally mars a frame - I might try a squeege next time.