Feeding ducklings at night and when to stop

[newbabyducks322]

My ducklings are almost three weeks old and I wanted to know if this is an okay age to stop feeding them 24/7? I bring them in (it's been hot so I let them go outside during the day) around 7 PM and let them back out at 9 AM. Is that an okay amount of time for them to be without food or water at their age?

 

[Kiki]

I am not familiar with ducks but I can tell you I don't feed my chickens at night but they do have access to water 27/7.

 

[chickens really]

I feed mine free choice till around 8 weeks old...Then I remove the feed and water at night...Yours are a little young yet....