For me it took 9sec. See log http://pastebin.com/pYGTFunH
Please go to ~/.atom/packages/platformio-ide/penv/lib/python2.7/site-packages/platformio/builder/scripts/atmelsam.py and comment this line https://github.com/platformio/platformio/blob/develop/platformio/builder/scripts/atmelsam.py#L90