We will respond within minutes with an auto-response to let you know "Hey, we got your ticket." Then, an agent will get busy on the matter and will update you as soon as possible afterwards. Response times vary depending on the complexity of the issue.
May I point you to a thread I wrote up about this very issue? It has a lot of valuable info (well, I hope it's valuable! ;) ) about which ISPs are giving us fits... ahem... having problems routing our emails properly.
Here's the thread: https://forum-en.guildwars2.com/forum/support/account/Not-Getting-Our-Mails-Note-for-Users-of-Gmail-Others/first#post2924424
The last thing we want to do is block you from playing the game you purchased! :( I am sure your ticket will be answered soon, but if you're not getting our mails, you might want to consider the suggestion of an alternative email point of contact, mentioned in my post tonight. That is a very solid way of working around this regretable situation. (Alternately post your ticket number and we'll give it a peek but if you're not getting our responses, that's not the best option. The alternative mail is best, really!) ~Gaile