According to the manufacturer, up to 3 months, in practice probably around 1.5 to 2.
Doesn't play a role for me, as I have the Ring hard-wired (mounted on the doorbell and supplied with power via the doorbell, the doorbell then also rings). If the Ring is to be operated exclusively by battery, the version with exchangeable battery is recommended

In my house the battery lasts about two months

In my home, the battery lasts about two months