What is the maximum length for an Android application name?

A short app name for display on the device menu (12 character max including spaces between ) and a longer name for the App Store or Android Market (30 character max, recommend 20 including spaces between).

The max length a name displayed under an icon in either the home screen or apps list will depend on device and user settings. The name in the Settings->Manager Applications list will usually be longer, but again depends on certain factors.