According to the Viagogo FAQ section, you should receive your tickets in the week that leads to the event because most event organizers issue tickets close to the event date.
Please note that if you are travelling to the event, you should add your travel address and the departure date in order Viagogo could ship your tickets to the right place as soon as they are ready to be shipped.
Please contact Viagogo Customer Service by phone at (866) 961-3071 or by email at customerservice@orders.viagogo.com for further assistance.