User blog comment:Jrotc193/Job requests/@comment-5268982-20130602182005/@comment-7418318-20130602210023

I'm pretty sure that they only said that 10 year quests havn't been completed in 10 years and followed by saying "and then there are even 100 year quests beyond that".

Now that can either mean the same principle but with 100 years time or, since they were talking about difficulty, it can mean that 100 year quests are much harder than 10 year quests.