I know someone that waited 12 years.

On month 7 waiting for Bill Cosby. That's the longest, thus far.

The longest was 2 years.

7 months
im still waiting on requests from like 2011 which have never come back

I'm pretty sure my longest was 8 months so far.

I was curious what's the longest wait, from the time you mailed out the request to the time the autograph arrived in your mailbox, you've had to wait for an autograph.
I'm new to this, have only gotten one authentic signature, which only took a few weeks, but i'm interested in other people's responses!