Exactly how many letters are in the dictionary? (merriam-webster)?

wondering.......thanks =)Exactly how many letters are in the dictionary? (merriam-webster)?
I think...

approx. 60,000
let see, in the "dictionary" there is exactly 10 letters if you count the "i" twice.Exactly how many letters are in the dictionary? (merriam-webster)?
26?Exactly how many letters are in the dictionary? (merriam-webster)?
A lot : 1,000,000,000,000,000
24 (merriam-webster dictionary) 15 if no letters are counted twice