How long will it take to replace a battery

Ask Apple, or whoever is providing the battery service. Some are using device swaps, some are battery swaps, and some likely ship out for a depot repair. The most recent in-store swap I’ve seen took a little over an hour. A depot swap can take a few days.

dumondr wrote:

It's been 20 days since they have received the unit! How long does it take to replace a battery? I could have sent it to a third party repair shop and had it done within a few days!

Best have a chat directly with Apple Support, then.

It's been 20 days since they have received the unit! How long does it take to replace a battery? I could have sent it to a third party repair shop and had it done within a few days!

Mine was done in less than 90 minutes. It really depends on availability of techs and materials.