How many hours would it take to go Great Wall from Shenzhen city?

hi im chris! ill be travelling this december to hk w/ my daughter and we want to see great wall of china. in my itinerary, we will take ferry boat from macau to shenzhen, and will be staying in china for 1 day. how can we be able to go to great wall of china via shenzhen? the only reason we want to go china is to see the Great Wall? how many hours would it take to go there from Shenzhen city where we will be staying at Days Hotel? pls help asap. thanks.