If you're boat runs aground, at high speed, you injure yourself and all you passengers, so you should check to make sure that all of your passengers are okay. The next thing you should do is check for damage.
Turn the ignition off and hang on tight.
Running aground, resulting in being "grounded", or aground. Run Aground. Should a vessel run aground and there be a tide that has receded enough to show the sea bottom, the vessel is said to be "high and dry." Also known as "Beached"
Switch off the engine.
That would be determined by the type of boat! First thing would be to determine if the boat is taking on water. If not, then determine the condition of your running gear and steering. If all is well, wait for high tide to float you off the shallows or get assistance and be towed off.
Head into the waves at a slight angle and reduce speed
Head into the waves at a slight angle and reduce speed
head into waves at a slight angle and reduce speed
Head into the waves at a slight angle and reduce speed
Head into the waves at a slight angle and reduce speed
Head into the waves at a slight angle and reduce speed
Head into the waves at a slight angle and reduce speed
That will depend on the type of boat, but it can be done in as little as 2 hours in a high speed ferry.