Personally i'd wait forever.
But theres good signs the album is comming this time. I mean the tour, leaked tracks (this is significant to me cos it shows there actually are recorded versions of songs ready for an album, and cos of the different versions, songs that are being worked on and improved, not just songs around that may one day be recorded). Plus axl said it will come this year. its not like he avoided the question as he used to a while back.
So i think its really comming, if not, well it'd be a shame, but i'll keep waiting!