I've had the same bag in it for months, so it lasts a long time, replacements are available cheaply from Aliexpress

According to Xiaomi, the bag should last approx. 75 days until it is full. This depends primarily on the dirt/size of the home. The bags are not designed to be used several times. Alternatively, you can switch off automatic vacuuming in the settings and empty the robot's container directly instead, as is the case with robots without a suction station.

1 x each.