I mailed out our invites Feb. 20th. I JUST received a returned invite in the mail today....a month and 10 days after I originally mailed them. And then we heard through the grapevine that someone didn't receive theirs - they moved since they gave us our address, but the invite never got returned to us OR forwarded.
You'd think after charging me $1.95 per invite to mail (long story), they would at least make it to their destination or be returned to us in a timely manner. WTF, post office? And you wonder why people are mailing physical letters less.