Adult hen has never layed any eggs.

[BDutch]

So ya know, it takes over 24 hours for the entire egg makin' process. So if you're getting 4 a day from 5 hens... she's laying; they're all laying.

Nowadays there are some laying hybrids that lay over 365 eggs a year. Not healthy but there really are hens who do.

But most hens from older breeds lay only 60 - 220 eggs a year. Many stop laying for about 2-4 months in winter.
Depending on the breed and individual hen there are big differences in egg production.
And there are more factors involved like the place you live , the age, the health and quality of the feed .

There is not a general number of hours that fits all.

 

[Ebony Rose]

There is not a general number of hours that fits all.

But she's a barred rock... Their average is 4 eggs per week, with 200 a year considered the norm. I would say that the OP is getting extra eggs because their hens are recently started pullets.

 

[BDutch]

But she's a barred rock... Their average is 4 eggs per week, with 200 a year considered the norm. I would say that the OP is getting extra eggs because their hens are recently started pullets.

Yes, you have a point there, referring to the barred rock hen.