It all depends on who you are writing to and how busy they are.
normally, i only write a paragraph unless its someone I really really like, then I would go to about 3 pages, but thats only happened a couple of time for me. I have gotten back within a week and some as long as 3 years. So it all depends. if who you are writing to has a website, see what their schedule is like. hope that helps.

HI, i'm very new to this (only started sending out LOR's last week), I just wanted to get people's own personal opinions on a couple of matters.

1. How long on average does a request for an autograph take to come back

2. How many out of every 10 autographs sent do you get back.

I know this will be different for everybody, but just wanted some feedback, so I know roughly what to expect.

Many thanks for your help