On WHICH planet or moon. Oceans if WHAT? Pure or salt water, liquid, methanol or ethanol?
Earth's oceans are already deep enough in light seconds, minutes and hours that salt water absorbs all sunlight so light NEVER reaches the bottom.
Look up how deep the Marianis trench is in whatever units you want. feet, meters, yards, inches, centimeters, kilometers, miles. DO THE MATH YOURSELF to convert that to light seconds, minutes, or hours, BUT the SPEED if light in water is NOT CONSTANT. It varies with the salinity of the water and with what is IN the water.
Earth's diameter is only roughly 6500 kilometers, not 10,000 or 100,000 kilometers or miles.
1 kilometer = 0.621 miles
ALL those little details MATTER.
Your question, as asked, CANNOT be answered because of insufficient information, NOT data in your question.
This is NOT a knowledge seeking question. It is a mocking, insulting, provoking, inflaming RANT targeted right at ONE SPECIFIC YA community member, ME, with
malicious intention to enrage me so I report your question AND you can claim YOU are the abuse victim.