'We're on an incredible high': James Webb Space Telescope scientists over the moon as observatory unfolds

William Harwood on Twitter: A very interesting update from Mike Menzel, NASA mission systems engineer: thanks to the accuracy of the Ariane 5 launch and two ultra-precise trajectory correction burns, Webb should have enough propellant, roughly speaking, to operate "around 20 years".

Webb telescope’s ‘golden eye’ opens in space, in last major hurdle Team behind landmark project celebrates 'amazing milestone' as machine completes its unfurling

NASA’s Webb Telescope Reaches Major Milestone as Mirror Unfolds