Do Guild Invites Expire?

The name says it all. Do Guild Invitations ever expire? So If I send a person an invite today, next month will it still be there for him, or will he not see it?

Pretty sure they don't until the person joins one. I know I had my invites for at least half a year before they had the cape toggle . lol

Yes, the invite stays on till the person join someone else, the person canceled it or the officer/leader canceled it.

Thanks everyone!