Putting it into perspective...
for our American cousins. When a new gas loading terminal was being built on the Forth near to the bridge back in the early eighties, one yank "engineer" was apparently giving the standard "We built this, we built that, bigger, better yadda, yadda, yadda" speech to some of the locals. One large Fifer, puts his arm around the yank and pointing at the Forth Bridge says "See that, well WE built that while you were still fighting the f**king indians!" Bragging session OVER!
The big difference in the paint job this time, unlike the last 'high-tech' paint job, is that they're taking the structure (cast iron) back to bare metal, not just slapping it over 100 years worth of 'red lead' paint. When they did that, back in the 90's (correct me if I'm wrong Mark M!), they sealed in all the moisture and the bridge started rotting under the paint, with some fairly large bits falling off!!
As for the 'lifespan' of this latest paint job, I'll just wait and see.
One question though, is the 20 years being measured from when the first sections were completed, or the last, as there'll be about a 10 year period between the two?
Mine is the "Craig & Rose" red one!