Give yourself about an hour to as much as an hour and a half from door to door... depends on time to get the car, toll stops, traffic depending on time of day. We drove 417 around noontime with NO problems... door to door an hour! Just bring lots of change for tolls (about $7 worth).
Traffic on 417 from Sanford is usually just backups at the toll plazas going in one direction, and only during rush hour... compared to I-4 which gets backed up at all hours.