I got 25 rolls out of the Freestyle Arista liquid C-41 kit.
It lasted over 18 months and I reused all the chems. I kept the developer in a plastic photo bottle and squeezed out the air after every use.
Kept it under the sink, nothing special.
I haven't tried the powdered version yet. I'm using the Rollei Digibase kit now and very pleased. It''s about 1 year old and I only have done about 6 films with it so far.
I d-i-y my 126 Instamatic, 127 and 120 color and take my 35mm color to Costco because they do a great job and every little bit of business helps keep it going.