“How long do I have to send out my thank you cards?”
Ideally, you would send thank you notes throughout the pre-wedding period as you receive gifts. A timely thank you is proper etiquette, so the sooner the better; however, it is never too late to be gracious. Remember to personalize the thank you note specific to the gift or include a memory from the big day.
It breaks my heart that so few people send thank you notes anymore. That’s a no brainer: always show appreciation for the gifts you receive, preferably in a handwritten note on fine stationery. I think I wrote my first thank you note in the first grade.