Alright, let's use Airbus as an example, then. The A350 (seems to be their most recent airliner) had its maiden flight in 2013, after being in development for 8 years, since 2005.

The A350XWB was launched in December 2006

There seems to be conflicting information. Sounds like they had orders lined up in 2005. One source says industrial launch was on 6 October 2005, another says final approval for the launch got delayed to 2006. All a bit ambiguous.

But in any case, it looks like Airbus has a similar development timeline for new planes that Boeing does. I suspect that is broadly applicable to other manufacturers as well. As a sanity check, I looked at the development of the smaller airliner from Bombardier (now Airbus A220) and it was January 2007 for industrial start, to September 2013 for maiden flight.