We have owned two styles of softeners. The first was a standard system that would cycle in the middle of the night when "enough" water had been passed to warrant a regeneration cycle.
The point of my email is the one we have had for the last 14 years is a cool design with two smaller tanks. No electricity. The totally water powered system alternates between tank A and tank B so that you can use water without paying attention to the cycle aspect. Works well.
I keep thinking I should add an alarm light so I know when the salt level gets low. RG gets cranky when I forget and the water gets hard. I don't think she likes her skin being the salt level warning device.