He kept using the skill until he received the distance which he had planned for.
Immediately after reaching the coast, he deactivated the skill and just stared at the surroundings.
'Phew, now from here the skill Accel won't be able to help me...', was what he thought.
It was true since the skill Accel wouldn't possibly allow him to dash at the same speed on the surface of the water!
Thus he had only one way left and that was to use the skill that he gained earlier during the quest of Gaiai.
Using the same very wings of the wyverns he thought about crossing the massive sea that separated him with his destination.
He could have even used the skill teleportation, but as mentioned earlier, it's maximum range was 1000 metres and if he were to teleport that distance, he would end up falling in the sea as the sea covered about 4,000 km of the remaining distance.