User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-2014385-20130827223125/@comment-16545476-20130828053221

http://dengekionline.com/elem/000/000/702/702090/

From the looks of it, it's like you can save up to a total of 50 quests,

And you can recieve an maxium of 10 quests from other players, after you complete the quests recieved from the others, it'll go into the 50 list.