How long does it take to Shenzhen Shekou Port from Luohu and is there a direct train?

No, there is no direct metro. You need to take metro line 1 from Luohu Station to Window of World Station first. Then transfer to metro line 2 to Shekou Port, Exit D1. After arriving, walk northwest around 200 yards to find the ticket hall. The whole way takes around an hour. And the ticket fare is CNY 7 per person.