x2 as terryg said - there are a LOT of variables.
My Easter Egger and Ideal 236 (white Leghorn Hybrid) are giving me 6 and a fraction per week.
My two barred Plymouth rocks are giving me something like 3.6 per week over a year period. (so basically every-other-day with some extra days thrown in).
The BPRs started in May of last year, the Easter Egger in Feb. of this year, and the Ideal 236 last October, I think, so all mine are young and heading to their prime laying periods. I had a gold sexlink that laid a jumbo egg daily like clock work. If you want a lot of eggs, investigate having a hybrid.
Check out www.Eggzy.net too, if you enter your eggs daily it will give you statistics on your flock which gives interesting insights.
Translated to daily, I guess it is most days 3 some days 4 or two from 4 layers........... We're up to about 18 eggs per week now....from hens.
BTW it sounds like your hens are doing very well.... :O)
Edited by ChicKat - 3/14/12 at 8:41pm