IANAL but it seems it's 3 months per visit, which accounts for time spent in Mexico, Canada and nearby islands (so that doesn't count as starting another visit)

IANAL but it seems it's 3 months per visit, which accounts for time spent in Mexico, Canada and nearby islands (so that doesn't count as starting another visit). http://travel.state.gov/content/visas/en/visit/visa-waiver-program.html#90days http://travel.state.gov/content/visas/en/visit/visa-waiver-p...