The minimum amount of time spent on the ground in New super mario bros 2 playthrough started

so I am doing a run of new super mario bros 2 where I spend the minimum amount of time on the floor, the rules I get 3 seconds at the start of the level or entering a new area before the seconds on ground count, The ground means the actual level floor so platforms, ? blocks, bricks etc dont count as being on the ground I just got through world 1 and with a total time spent on ground of 38, 20 of which were in the final castle of world 1, it can definitely be optimized, but im probably going to be posting my progress again later, im going to be taking a standard path except skipping any water levels, as the game allows because they basically are the same