A couple nebulous time periods here, but otherwise pretty straightforward...
(source: Canadian CX-3 manual, page 3-39)
Break-In Period
No special break-in is necessary, but a few precautions in the first 1,000 km (600 miles) may add to the performance, economy, and life of the vehicle.
-- Do not race the engine.
-- Do not maintain one constant speed,
either slow or fast, for a long period of
time.
-- Do not drive constantly at full-throttle or
high engine rpm for extended periods of
time.
-- Avoid unnecessary hard stops. Avoid full-throttle starts.