[sowbug]

Once it starts for me, it's not stopping for at least a couple hours, even if I immediately get back on solid ground.

But I used to get sick playing Quake, so maybe I'm in the 11 group.

[ziml77]

Do you retain the sensation that everything is still wobbling? I would get that after being on a boat for long enough. Though motion sickness never made me feel ill to my stomach, rather it just gives me the worst headaches that require fresh air and time to relieve.

[sowbug]

Just nausea for me. What you're describing sounds like the recovery phase of sea legs.