My iPhone 6s’ battery has been losing efficacy over time, and its processor has been performance-throttled for the past two months. So, I’m sending it to Apple for a battery replacement. I opted for the mail-in procedure because I’m lazy.
I’ll be without my phone for “five to nine business days,” which sounds like two weeks to me. I haven’t been without a mobile phone since 1995! (My first phone was an analog Motorola microTAC.)