[James2001]

Actually, the current 'Down titles were introduced at the beginning of 2012.

Even then, that's 11 years without a change, which is a very long time in TV terms.

The soaps haven't been much different though, with EastEnders introducing their current titles in 2009, Corrie in 2010 and Emmerdale in 2011. Corrie did alter a couple of shots when they moved to the current set, and EastEnders added the Olympic park at the start of 2012, but still very long times with few to no changes.

Admittedly not quite the longest, yet, as Corrie and Emmerdale (Farm, as it was then) both had titles that lasted 14 years (again, with a change to the end shot on Corrie when they moved outdoor sets in 1982), but I can see both soaps current sets outlasting them.