Has anyone sent their iphone to apple for repair?

I want to get my iphone battery replaced. How long would I be without my phone?

I don't really know about apple but if you haven't sent it yet I got my screen fix a www.dbrepairs.co.uk and it only took 3 days once I posted it to arrive back good as new and i got 5% off when i signed up so it would only cost you about 20 pound.