I sent a LOR, SASE, and one 5x7 photo to Oscar Nunez via the address in the database on April 2nd and received a response today, May 14th, for a total of 42 days (or 6 weeks). Oscar is probably best known for playing a character with the same name on the US version of The Office, but he's appeared in a bunch of different shows and a handful of films over the years as well. It's an awesome personalized autograph:
I usually pick neutral-looking stationery but the one I used was a little more decorated than usual, and he must have liked it because he drew a little picture of the design! This is what it looked like, for reference:
Last five received: Seth MacFarlane, Oscar Nunez, Jesse Tyler Ferguson, Kenneth Branagh, Imelda Staunton
Most wanted: Neil Patrick Harris, Martin Short, Jim Rash, Charles Esten, Sara Bareilles, Josh Groban