In the Android URL parameters section, the Point of Sale API - Mobile Web Technical Reference explicitly specifies the possible auto return timeout to be within the range of 3200 to 10000 milliseconds. The iOS additional payment options section only defines the auto return timeout to be a "short timeout". Is the iOS timeout within the same time range as Android or is it something else entirely?
The auto_return timeout for iOS is 2 seconds. I also want to note that it's subject to change, but unlikely.