How long does it take to update IOS 8.2 on a iPhone 4s?

[iMore Question]

I want to update but I will need my phone and I'm scared that if I update, it will take quite long -just like the last update- and I will not be able to use my phone.

 

[phreddyl]

took me around 10 minutes. all depends on your wifi speed

 

[ricarda46]

Please help my iphone wont work, cant do anything...