I have left water in the garbage cans for weeks at a time. I keep mine heated to tempo and circulating. No loss of elements and it tests the same as it does the day I made it.
180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18