Does anyone know if there is a single book limit for the author signings? I have tickets to see Scott Lynch and I want him to sign my copy of Lies of Lock Lamora but I also would love to get a copy signed to give to my best friend who introduced me to his books and my brother has been bugging me to get one for him too (though three books seems like too much to me). Do you think that would be too much to get two (or three) copies signed? 

I have searched the forums and the writers symposium page but I can't find the information anywhere so any help would be appreciated. 

I don't want to be a bother to the authors.