This will be different for everybody depending on the pieces and where you're keeping the cleaner.
Mine is stashed on a shelf behind the dab bar and kept at room temp. It usually has iso in the tank 24/7 unless I'm changing it out
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Life span of the tank depends.
If you're cleaning combustion smoking pieces like pipes and bowls, your tank is gonna gunk up with tar and get nasty after a bath or two.
Deep cleaning dab rigs and pieces that have held reclaim oil will also foul up a tank and lessen it's ability to deep clean.
Parts like my peak topper, glass tips for joints, lobo capsules, puffco heating chambers give me a very long lifespan on the tank since there's no heavy tar.
Life is indefinite really as long as the lid is kept on. There's very little evap with the lid and as long as it only gets warm during a wash cycle, mine seem to hold a tank well.
This one is about 40 days in and I think I topped it off once with about 1/2 quart.
I'm gonna deep clean some parts soon with this bath then change it out for a fresh tank.
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I leave my parts in the iso bath until needed. Then I rinse them off, dry them, and they're ready for action.
The tank on my cleaner is always loaded and pretty much like what you're saying, drop a piece in after each use so I'm always using a clean and sterile piece.
I turn it on each morning so it warms and runs a cycle and just add and take parts thru the day.
I get 70% iso from costco at $7 for two quarts. Higher % iso would probably work faster, IDK, but the cheap 70% stuff works fantastic for me in a sonic cleaner. Spotless and sterile in about 5 minutes
