Collectively? Probably 4 hours a week. We have 6 tanks at the moment tho. And I like to hand feed my corals, eel, Lionfish and puffers so that takes quite some time.
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I do the same thing because I do not have a sump and for me it is just easier to have water in a 30 gallon brut can that is the same temp as my tank to top off and also to mix my salt the day before I do a water changeHere is a simple hack... When making your water, boil about 6 cups of RODI water (NOT mixed salt water!!) to bring up about 5g of water to temp. You should be just about right in about 15 mins.
If you have the space, what I do is keep several Brute cans of water on hand at all times. 1 can is cold fresh water, 1 is fresh at tank temp, and 1 is mixed at tank temp. The mixed can is also on wheels for easy movement from the water station to the tanks.
I use several digital readout aquarium heaters and an inexpensive digital kitchen thermometer to ensure all temps are consistent.
This may sound overkill but for me, I have found it necessary. My 55g does not have a sump so I don't have a good place to put a sensor for an ATO. Therefore I do my top-offs by hand every few days. This is usually a gallon or so of fresh water. It is MUCH easier to simply grab a couple pitchers of water that is already at temp and pour it in than to fiddle with getting cold water to the correct temp. It also makes mixing new SW easier as I don't have to wait for the water to warm up to use it if I should need more than what I keep on hand.