Momento-us question

You know that desease from Momento, where you can only remember a few minutes at a time? My cousin Harold got that. He bumped his head and spend a week at the hospital, and has been calling around to thank people for the letters and flowers he got while he was there. My question is, how long before it is okay to ignore his calls. I mean, he has been calling to thank me for the letter every day for almost two years, now, which is a lot of gratitude for a yellow stickynote that says "Get well" on it. My mother changed her number, but that is not an option for me, as I worked hard and bribed many to get a number that kinda spells my name. A couple of letters are missing, since my name is longer than a standard phonenumber, but they were unwilling to give me a special long number.