Upvote:2
Google maps says you might not make it on time. On a regular weekday (Monday for example) it says you should leave HAN aiport at 08:00 to arrive at 11:00 in Ha Long Bay. For a cruise that leaves at 12:30, let's say you have to be there by 12:00, you would have to leave at 08:50 which is ten minutes after your planned 60 minutes to deal with immigration and luggage collection. Overall, this seems like you would be cutting it fairly short. Your best bet is to book a cruise which leaves later during the day.