In Mark 6, during about which watch of the night did Jesus come walking on the sea?

Answer: The fourth

Seeing the disciples straining at the oars against the wind, Jesus came to them about the fourth watch of the night.

“He could see that the disciples were straining to row, because the wind was against them. About the fourth watch of the night, Jesus went out to them, walking on the sea. He intended to pass by them,”— Mark 6:48 (BSB)