I've got the same turkey. As I did last year.
I haven't checked the exact weight yet but i cook mine on the day.
We usually eat at about 1.30pm. I start cooking it between 9 10am. I just follow the instructions on the packaging and it always turns out fine..........................................................................................................
Just checked, it's a 5.6kg. It says that it will take 3hrs and 20 mins. Obviously this is only a guide.
I've never understood why people have to get up in the middle of the night to put the turkey in!!!