How long does it take the heaters to reach a stable tank temp?

[alzika]

I've had it in there for about 2 hours now. I'm wondering how long it takes so I can move my fish over to their quarantine tank for ich treatment.

 

[383camaro]

That would depend on the tank size and heater wattage. most heaters recommend 24 hrs before the temp to stabilize. has the ligth turned off on the heater?

 

[clevername]

How would we ever be able to answer that without knowing your tank size and what type/wattage of heater.......

Also common sense would say, wait till the water heats up to the temperature you want; then you can add fish.