How long will photos take to download?

[iMore Question]

i've turned on iCloud photo library it has deleted all the pictures from my computer and the ones i lost whilst downloading ios8. I still have pictures from the camera roll, but i wanted to know exactly how it works , how long will it take? because i hope i haven't risked anything

 

[Just_Me_D]

how long will it take to download?

The link below may prove useful to you.

http://www.imore.com/icloud-photo-library