# On this second day

"on this second day of feasting"

# during the banquet of wine

"as they were drinking wine" or "during the banquet." They were probably also eating food, not only drinking wine.

# What is your petition

"What do you ask for" or "What do you want" 

# It will be granted to you

"I will give you what you ask for" or "I will do for you what you ask" 

# Up to half of the kingdom, and it will be granted

"If you ask for up to half of my kingdom, I will give it to you"